Essentials of Anatomy and Physiology, 9e (Marieb)
1
Chapter 6
1
The Muscular System
1
Short Answer
1
Figure 6.1
Using Figure 6.1, match the following:
1
1)
1
The I band within a skeletal muscle fiber is indicated by letter ______.
1
Answer:
1
B
1
Diff: 1
1
Page Ref: 188
1
2)
1
The A band within a skeletal muscle fiber is indicated by letter ______.
1
Answer:
1
A
1
Diff: 2
1
Page Ref: 188
1
3)
1
The lighter central area of the A band is indicated by letter ______.
1
Answer:
1
D
1
Diff: 2
1
Page Ref: 188
1
4)
1
The thin filament is indicated by letter ______.
1
Answer:
1
C
1
Diff: 2
1
Page Ref: 188
1
Figure 6.2
Using Figure 6.2, match the following:
1
5)
1
The connective tissue "overcoat" that wraps the entire muscle is indicated by letter ______.
1
Answer:
1
A
1
Diff: 1
1
Page Ref: 185
1
6)
1
The connective tissue that wraps a fascicle, or bundle of muscle fibers, is indicated by letter ______.
1
Answer:
1
C
1
Diff: 2
1
Page Ref: 185
1
7)
1
The muscle fiber is indicated by letter ______.
1
Answer:
1
D
1
Diff: 1
1
Page Ref: 185
1
8)
1
The endomysium that wraps individual muscle fibers is indicated by letter ______.
1
Answer:
1
B
1
Diff: 1
1
Page Ref: 185
1
Fill in the blank or provide a short answer:
1
9)
1
Only ______muscle cells are cylindrical and multinucleated.
1
Answer:
1
skeletal
1
Diff: 1
1
Page Ref: 184
1
10)
1
The muscle tissue that normally exhibits voluntary contractions is ______muscle.
1
Answer:
1
skeletal
1
Diff: 1
1
Page Ref: 185
1
11)
1
Only ______muscle cells possess intercalated discs.
1
Answer:
1
cardiac
1
Diff: 1
1
Page Ref: 186
1
12)
1
Skeletal muscle is often attached to bone by strong, cordlike structures called ______.
1
Answer:
1
tendons
1
Diff: 1
1
Page Ref: 185
1
13)
1
The ______zone of a sarcomere contains no actin filaments while the skeletal muscle is at rest (noncontractile state).
1
Answer:
1
H
1
Diff: 1
1
Page Ref: 187; 189
1
14)
1
The heads of the myosin myofilaments are called ______when they link the thick and thin filaments together during skeletal muscle contraction.
1
Answer:
1
cross bridges
1
Diff: 1
1
Page Ref: 189
1
15)
1
The gap between the motor neuron and the muscle fiber it supplies at the neuromuscular junction is called the ______.
1
Answer:
1
synaptic cleft
1
Diff: 1
1
Page Ref: 189
1
16)
1
When a skeletal muscle is fully contracted, the ______are closer to the thick filaments.
1
Answer:
1
Z discs
1
Diff: 2
1
Page Ref: 192
1
17)
1
The only energy source that can be used to directly power muscle activity is ______.
1
Answer:
1
ATP
1
Diff: 2
1
Page Ref: 195
1
18)
1
A smooth, sustained contraction is called ______.
1
Answer:
1
tetanus
1
Diff: 1
1
Page Ref: 194
1
19)
1
The ______of a muscle is attached to the immovable or less movable bone.
1
Answer:
1
origin
1
Diff: 1
1
Page Ref: 198-199
1
20)
1
The movement that is commonly seen in a ball-in-socket joint, that includes a combination of flexion, extension, abduction, and adduction, is called ______.
1
Answer:
1
circumduction
1
Diff: 2
1
Page Ref: 199
1
21)
1
The muscle that has the major responsibility for causing a particular movement is the ______.
1
Answer:
1
prime mover
1
Diff: 1
1
Page Ref: 202
1
22)
1
The arrangement of fascicles in orbicularis oris is ______.
1
Answer:
1
circular
1
Diff: 1
1
Page Ref: 204; 207
1
23)
1
The muscle referred to as the "smiling" muscle because it raised the corners of the mouth upward is the ______.
1
Answer:
1
zygomaticus
1
Diff: 2
1
Page Ref: 207
1
24)
1
The ______muscle runs deep to the external oblique muscle.
1
Answer:
1
internal oblique
1
Diff: 1
1
Page Ref: 209
1
25)
1
The quadriceps femoris muscle group is composed of the three vastus muscles and the ______muscle.
1
Answer:
1
rectus femoris
1
Diff: 2
1
Page Ref: 214
1
26)
1
An inherited disease that causes muscles to degenerate and atrophy is known as ______.
1
Answer:
1
muscular dystrophy
1
Diff: 2
1
Page Ref: 221
1
Multiple Choice
1
1)
1
Muscle tissue that has involuntary regulation of contraction is:
1
A)
1
cardiac muscle only
1
B)
1
smooth muscle only
1
C)
1
skeletal muscle only
1
D)
1
cardiac muscle and smooth muscle
1
E)
1
cardiac muscle and skeletal muscle
1
Answer:
1
D
1
Diff: 2
1
Page Ref: 185-186
1
2)
1
The muscle tissue type that consists of single, very long, cylindrical, multinucleate cells with very obvious striations is:
1
A)
1
cardiac muscle only
1
B)
1
smooth muscle only
1
C)
1
skeletal muscle only
1
D)
1
cardiac and smooth muscle
1
E)
1
cardiac and skeletal muscle
1
Answer:
1
C
1
Diff: 2
1
Page Ref: 183-185
1
Figure 6.3
1
3)
1
The type of muscle tissue pictured in Figure 6.3 is:
1
A)
1
skeletal muscle
1
B)
1
voluntary
1
C)
1
striated
1
D)
1
found only in the heart
1
E)
1
smooth muscle
1
Answer:
1
E
1
Diff: 2
1
Page Ref: 184
1
4)
1
The plasma membrane of a muscle cell is called the:
1
A)
1
sarcolemma
1
B)
1
sarcomere
1
C)
1
myofilament
1
D)
1
sarcoplasm
1
E)
1
sarcoplasmic reticulum
1
Answer:
1
A
1
Diff: 3
1
Page Ref: 187
1
5)
1
Which of the following does not describe cardiac muscle tissue:
1
A)
1
uninucleate
1
B)
1
striations
1
C)
1
involuntary
1
D)
1
rhythmic contractions
1
E)
1
attached to bones
1
Answer:
1
E
1
Diff: 2
1
Page Ref: 186
1
6)
1
What type of membrane wraps a fascicle:
1
A)
1
endomysium
1
B)
1
epimysium
1
C)
1
aponeuroses
1
D)
1
perimysium
1
E)
1
tendons
1
Answer:
1
D
1
Diff: 2
1
Page Ref: 185
1
7)
1
Which of the following is NOT a function of the muscular system:
1
A)
1
production of movement
1
B)
1
maintenance of posture
1
C)
1
stabilization of joints
1
D)
1
generation of heat
1
E)
1
hematopoiesis
1
Answer:
1
E
1
Diff: 1
1
Page Ref: 187
1
8)
1
A sarcomere is:
1
A)
1
the nonfunctional unit of skeletal muscle
1
B)
1
the contractile unit between two Z discs
1
C)
1
the area between two intercalated discs
1
D)
1
the wavy lines on the cell, as seen in a microscope
1
E)
1
a compartment in a myofilament
1
Answer:
1
B
1
Diff: 2
1
Page Ref: 187
1
9)
1
Which one of the following is composed of myosin protein:
1
A)
1
thick filaments
1
B)
1
thin filaments
1
C)
1
all myofilaments
1
D)
1
Z discs
1
E)
1
light bands
1
Answer:
1
A
1
Diff: 2
1
Page Ref: 187-189
1
10)
1
Place these structures of the skeletal muscle in order from largest to smallest:
1.fascicle
2.myofilament
3.muscle fiber (cell)
4.myofibril
5.sarcomere
1
A)
1
1, 3, 4, 5, 2
1
B)
1
1, 4, 3, 2, 5
1
C)
1
2, 5, 4, 3, 1
1
D)
1
3, 1, 2, 4, 5
1
E)
1
3, 2, 5, 4, 1
1
Answer:
1
A
1
Diff: 3
1
Page Ref: 185-189
1
11)
1
The axon terminals of a nerve cell and the sarcolemma of a skeletal muscle cell join at the:
1
A)
1
motor unit
1
B)
1
neuromuscular junction
1
C)
1
synaptic cleft
1
D)
1
action potential
1
E)
1
myofibril
1
Answer:
1
B
1
Diff: 3
1
Page Ref: 189
1
12)
1
Which one of the following functions do calcium ions perform during skeletal muscle contraction:
1
A)
1
increase the action potential transmitted along the sarcolemma
1
B)
1
release the inhibition on Z discs
1
C)
1
expose myosin binding sites on the actin
1
D)
1
cause ATP binding to actin
1
E)
1
bind to regulatory proteins on the myosin filaments, changing both their shape and their position on the thick filaments
1
Answer:
1
C
1
Diff: 2
1
Page Ref: 193
1
13)
1
The mechanical force of contraction is generated by:
1
A)
1
shortening of the thick filaments
1
B)
1
shortening of the thin filaments
1
C)
1
a sliding of thin filaments past thick ones
1
D)
1
the "accordian-like" folding of thin and thick filaments
1
E)
1
the temporary disappearance of thin filaments
1
Answer:
1
C
1
Diff: 2
1
Page Ref: 192
1
14)
1
Acetylcholine is:
1
A)
1
an ion pump on the postsynaptic membrane
1
B)
1
a source of energy for muscle contraction
1
C)
1
a component of thick myofilaments
1
D)
1
an oxygen-binding protein
1
E)
1
a neurotransmitter that stimulates skeletal muscle
1
Answer:
1
E
1
Diff: 1
1
Page Ref: 189
1
15)
1
The gap between the axon terminal of a motor neuron and the sarcolemma of a skeletal muscle cell is called the:
1
A)
1
motor unit
1
B)
1
sarcomere
1
C)
1
neuromuscular junction
1
D)
1
synaptic cleft
1
E)
1
cross bridge
1
Answer:
1
D
1
Diff: 2
1
Page Ref: 189
1
16)
1
Neurotransmitters are released upon stimulation from a nerve impulse by the:
1
A)
1
myofibrils
1
B)
1
motor unit
1
C)
1
thick filaments
1
D)
1
axon terminals of the motor neuron
1
E)
1
sarcolemma of the muscle cell
1
Answer:
1
D
1
Diff: 2
1
Page Ref: 189
1
17)
1
An elaborate and specialized network of membranes in skeletal muscle cells that function in calcium storage is the:
1
A)
1
sarcolemma
1
B)
1
mitochondria
1
C)
1
intermediate filament network
1
D)
1
myofibrillar network
1
E)
1
sarcoplasmic reticulum
1
Answer:
1
E
1
Diff: 1
1
Page Ref: 189
1
18)
1
During skeletal muscle contraction, myosin cross bridges attach to active sites of:
1
A)
1
myosin filaments
1
B)
1
actin filaments
1
C)
1
Z discs
1
D)
1
thick filaments
1
E)
1
the H zone
1
Answer:
1
B
1
Diff: 1
1
Page Ref: 192
1
19)
1
The major function of the sarcoplasmic reticulum in skeletal muscle contraction is to:
1
A)
1
make and store phosphocreatine
1
B)
1
synthesize actin and myosin myofilaments
1
C)
1
provide a source of myosin for the contraction process
1
D)
1
regulate intracellular calcium concentration
1
E)
1
store ATP
1
Answer:
1
D
1
Diff: 2
1
Page Ref: 189
1
20)
1
The striations that give skeletal muscle its characteristic striped appearance are produced, for the most part, by:
1
A)
1
a difference in the thickness of the sarcolemma
1
B)
1
the arrangement of myofilaments
1
C)
1
the sarcoplasmic reticulum
1
D)
1
the T tubules
1
E)
1
the "cocked" positions of the heads of the thick filaments
1
Answer:
1
B
1
Diff: 2
1
Page Ref: 189
1
21)
1
Which of these events must occur first to trigger the skeletal muscle to generate an action potential and contract:
1
A)
1
sodium ions rush into the cell
1
B)
1
acetylcholine (ACh) causes temporary permeability to sodium
1
C)
1
diffusion of potassium ions out of the cell
1
D)
1
operation of the sodium-potassium pump
1
E)
1
acetylcholinesterase (AchE) breaks down acetylcholine (ACh)
1
Answer:
1
B
1
Diff: 3
1
Page Ref: 189-190
1
22)
1
A skeletal muscle twitch differs from a tetanic contraction in that:
1
A)
1
the tetanic contraction is considered abnormal, while the twitch is a normal muscle response
1
B)
1
the tetanic contraction is caused by a single stimulus, while the twitch is caused by very rapid multiple stimuli
1
C)
1
the muscle twitch is prolonged and continuous while a tetanic contraction is brief and "jerky"
1
D)
1
the muscle twitch occurs only in small muscles while a tetanic contraction occurs in large muscle groups
1
E)
1
the muscle twitch is a brief and "jerky" movement, while the tetanic contraction is prolonged and continuous
1
Answer:
1
E
1
Diff: 3
1
Page Ref: 194
1
23)
1
Creatine phosphate (CP) functions within the muscle cells by:
1
A)
1
forming a temporary chemical compound with myosin
1
B)
1
forming a chemical compound with actin
1
C)
1
inducing a conformational change in the myofilaments
1
D)
1
storing energy that will be transferred to ADP to resynthesize ATP as needed
1
E)
1
storing energy that will be transferred to ATP to resynthesize ADP as needed
1
Answer:
1
D
1
Diff: 2
1
Page Ref: 195
1
24)
1
The condition of skeletal muscle fatigue can be best explained by:
1
A)
1
the all-or-none law
1
B)
1
the inability to generate sufficient quantities of ATP due to feedback regulation of synthesis
1
C)
1
insufficient intracellular quantities of ATP due to excessive consumption
1
D)
1
a total lack of ATP
1
E)
1
inadequate numbers of mitochondria
1
Answer:
1
C
1
Diff: 1
1
Page Ref: 195-196
1
25)
1
Which one of the following muscle actions would NOT be classified as an ISOTONIC contraction:
1
A)
1
pushing against a stationary wall
1
B)
1
lifting a glass of water to your mouth
1
C)
1
writing a letter
1
D)
1
tying your shoe
1
E)
1
throwing a ball
1
Answer:
1
A
1
Diff: 1
1
Page Ref: 197
1
26)
1
Anaerobic glycolysis occurs without:
1
A)
1
ATP
1
B)
1
oxygen
1
C)
1
lactic acid
1
D)
1
carbon dioxide
1
E)
1
glucose
1
Answer:
1
B
1
Diff: 3
1
Page Ref: 195
1
27)
1
Which of these pathways to regenerate ATP during muscle activity is the fastest:
1
A)
1
direct phosphorylation of ADP by creatine phosphate
1
B)
1
aerobic respiration
1
C)
1
anaerobic glycolysis and lactic acid formation
1
D)
1
oxidative phosphorylation
1
E)
1
both aerobic respiration and anaerobic glycolysis
1
Answer:
1
C
1
Diff: 3
1
Page Ref: 195
1
28)
1
The insertion of the gluteus maximus is the:
1
A)
1
sacrum
1
B)
1
tibia
1
C)
1
ilium
1
D)
1
calcaneus
1
E)
1
femur
1
Answer:
1
E
1
Diff: 2
1
Page Ref: 211
1
29)
1
Which of the following muscles closes the jaw:
1
A)
1
the buccinator
1
B)
1
the masseter
1
C)
1
the frontalis
1
D)
1
the sternocleidomastoid
1
E)
1
the masseter and the temporalis
1
Answer:
1
E
1
Diff: 2
1
Page Ref: 207
1
30)
1
Sandra is playing the piano for her recital. Which muscle is not involved in the movement of her hands and/or fingers:
1
A)
1
flexor carpi radialis
1
B)
1
flexor carpi ulnaris
1
C)
1
extensor digitorum
1
D)
1
extensor digitorum longus
1
E)
1
extensor carpi radialis
1
Answer:
1
D
1
Diff: 2
1
Page Ref: 219
1
31)
1
Which of the following muscles inserts on the calcaneus:
1
A)
1
the semitendinosus
1
B)
1
the sartorius
1
C)
1
the tibialis anterior
1
D)
1
the soleus
1
E)
1
the iliopsoas
1
Answer:
1
D
1
Diff: 2
1
Page Ref: 214; 219
1
32)
1
Which one of the following does NOT compress the abdomen:
1
A)
1
internal oblique
1
B)
1
external oblique
1
C)
1
transversus abdominis
1
D)
1
latissimus dorsi
1
E)
1
rectus abdominis
1
Answer:
1
D
1
Diff: 2
1
Page Ref: 209
1
33)
1
A muscle located on the ventral (anterior) side of the body is the:
1
A)
1
pectoralis major
1
B)
1
occipitalis
1
C)
1
gastrocnemius
1
D)
1
gluteus medius
1
E)
1
latissimus dorsi
1
Answer:
1
A
1
Diff: 1
1
Page Ref: 208
1
34)
1
A nursing infant develops a powerful sucking muscle that adults also use for whistling or blowing a trumpet called the:
1
A)
1
platysma
1
B)
1
masseter
1
C)
1
zygomaticus
1
D)
1
buccinator
1
E)
1
temporalis
1
Answer:
1
D
1
Diff: 1
1
Page Ref: 207
1
35)
1
Which of these muscles is not responsibile for flexion or extension of the arm?
1
A)
1
biceps brachii
1
B)
1
triceps brachii
1
C)
1
brachialis
1
D)
1
platysma
1
E)
1
latissimus dorsi
1
Answer:
1
D
1
Diff: 3
1
Page Ref: 210; 211
1
36)
1
A muscle group that works with and assists the action of a prime mover is a(n):
1
A)
1
antagonist only
1
B)
1
fixator only
1
C)
1
synergist only
1
D)
1
antagonist and synergist
1
E)
1
antagonist and fixator
1
Answer:
1
C
1
Diff: 1
1
Page Ref: 202
1
37)
1
Which of the following muscles is not involved in dorsiflexion and/or plantar flexion of the foot:
1
A)
1
gastrocnemius
1
B)
1
tibialis anterior
1
C)
1
extensor digitorum longus
1
D)
1
soleus
1
E)
1
iliopsoas
1
Answer:
1
E
1
Diff: 3
1
Page Ref: 212; 214
1
38)
1
Which one of the following is the action of the orbicularis oris:
1
A)
1
closes, purses, and protrudes the lips
1
B)
1
pulls the lower lip down and back
1
C)
1
draws the eyebrows together
1
D)
1
allows blinking, squinting, and various other protective mechanisms for the eye
1
E)
1
closes the jaw
1
Answer:
1
A
1
Diff: 1
1
Page Ref: 207
1
39)
1
Paralysis of which of the following would make an individual unable to flex the thigh:
1
A)
1
biceps femoris
1
B)
1
vastus medialis
1
C)
1
vastus lateralis
1
D)
1
vastus intermedius
1
E)
1
iliopsoas and rectus femoris
1
Answer:
1
E
1
Diff: 2
1
Page Ref: 212; 214
1
40)
1
Which one of the following muscles is involved in abduction of the arm at the shoulder joint:
1
A)
1
deltoid
1
B)
1
biceps brachii
1
C)
1
triceps brachii
1
D)
1
latissimus dorsi
1
E)
1
pectoralis major
1
Answer:
1
A
1
Diff: 2
1
Page Ref: 210
1
41)
1
Which of the following muscles adducts the thigh:
1
A)
1
peroneus muscles
1
B)
1
gluteus maximus
1
C)
1
sartorius
1
D)
1
quadriceps group
1
E)
1
adductor muscles
1
Answer:
1
E
1
Diff: 1
1
Page Ref: 214
1
42)
1
While doing "jumping jacks" during an exercise class, your arms and legs move laterally away from the midline of your body. This motion is called:
1
A)
1
extension
1
B)
1
flexion
1
C)
1
abduction
1
D)
1
adduction
1
E)
1
circumduction
1
Answer:
1
C
1
Diff: 1
1
Page Ref: 199
1
43)
1
Which of the following muscles are antagonists:
1
A)
1
biceps brachii and triceps brachii
1
B)
1
bicpes femoris and biceps brachii
1
C)
1
vastus medialis and vastus lateralis
1
D)
1
masseter and temporalis
1
E)
1
gastrocnemius and soleus
1
Answer:
1
A
1
Diff: 3
1
Page Ref: 211
1
44)
1
Paralysis of which of the following would make an individual unable to flex the knee:
1
A)
1
hamstring muscle group
1
B)
1
gluteal muscle group
1
C)
1
gastrocnemius
1
D)
1
sartorius
1
E)
1
iliopsoas
1
Answer:
1
A
1
Diff: 3
1
Page Ref: 214
1
45)
1
Which one of the following is NOT a criteria generally used in naming muscles:
1
A)
1
relative size of the muscle
1
B)
1
number of origins of the muscle
1
C)
1
shape of the muscle
1
D)
1
method of attachment of the muscle to bone
1
E)
1
action of the muscle
1
Answer:
1
D
1
Diff: 2
1
Page Ref: 204
1
True/False
1
1)
1
Skeletal muscle is considered involuntary because it is the only type of muscle usually subject to conscious control.
1
Answer:
1
FALSE
1
Diff: 1
1
Page Ref: 183; 185
1
2)
1
The epimysium covers individual muscle fibers.
1
Answer:
1
FALSE
1
Diff: 1
1
Page Ref: 185
1
3)
1
Skeletal muscles need nerve stimulation for contraction to occur.
1
Answer:
1
TRUE
1
Diff: 1
1
Page Ref: 189
1
4)
1
A nerve cell and all the muscle cells that it stimulates are referred to as a motor unit.
1
Answer:
1
TRUE
1
Diff: 1
1
Page Ref: 189
1
5)
1
A contraction in which a skeletal muscle does not shorten but its tension increases is called isometric.
1
Answer:
1
TRUE
1
Diff: 1
1
Page Ref: 197
1
6)
1
Cardiac muscle fibers are relatively short, tapering cells within a single centrally located nucleus.
1
Answer:
1
FALSE
1
Diff: 1
1
Page Ref: 186
1
7)
1
The neurotransmitter used by the nervous system to activate skeletal muscle cells is acetylcholine.
1
Answer:
1
TRUE
1
Diff: 1
1
Page Ref: 189
1
8)
1
Thick filaments are made of a protein called actin.
1
Answer:
1
FALSE
1
Diff: 1
1
Page Ref: 189
1
9)
1
One of the important functions of skeletal muscle is to generate heat.
1
Answer:
1
TRUE
1
Diff: 1
1
Page Ref: 187
1
10)
1
Lactic acid results from aerobic respiration.
1
Answer:
1
FALSE
1
Diff: 2
1
Page Ref: 195
1
11)
1
A sustained partial contraction of skeletal muscle is called muscle tone.
1
Answer:
1
TRUE
1
Diff: 1
1
Page Ref: 197
1
12)
1
An aponeurosis is a ropelike piece of muscle fascia that forms indirect connections to muscles of the leg.
1
Answer:
1
FALSE
1
Diff: 1
1
Page Ref: 185
1
13)
1
A muscle twitch results when the muscle is stimulated so rapidly that no evidence of relaxation is seen.
1
Answer:
1
FALSE
1
Diff: 2
1
Page Ref: 194
1
14)
1
The effect of the neurotransmitter on the muscle cell membrane is to temporarily modify its permeability of ions such as Na+ and K+.
1
Answer:
1
TRUE
1
Diff: 2
1
Page Ref: 189-190
1
15)
1
When a muscle fiber contracts, the I bands diminish in size, the H zones disappear, and the A bands move closer together but do not diminish in length.
1
Answer:
1
TRUE
1
Diff: 2
1
Page Ref: 192
1
16)
1
The insertion of the biceps brachii muscle is on the radius.
1
Answer:
1
FALSE
1
Diff: 2
1
Page Ref: 211
1
17)
1
A prime mover of the arm that acts in adduction is the deltoid.
1
Answer:
1
FALSE
1
Diff: 1
1
Page Ref: 210
1
18)
1
The deepest muscle of the abdominal wall is the transversus abdominis.
1
Answer:
1
TRUE
1
Diff: 2
1
Page Ref: 209
1
19)
1
Dorsiflexion and plantar flexion are synergistic actions.
1
Answer:
1
FALSE
1
Diff: 1
1
Page Ref: 202
1
20)
1
Plantar flexion at the ankle joint is accomplished by the tibialis anterior muscle.
1
Answer:
1
FALSE
1
Diff: 2
1
Page Ref: 214
1
21)
1
The bicpes brachii muscle is named for the two heads that orginiate from the shoulder girdle.
1
Answer:
1
TRUE
1
Diff: 2
1
Page Ref: 211
1
22)
1
There are 206 skeletal muscles in the human body.
1
Answer:
1
FALSE
1
Diff: 1
1
Page Ref: 198
1
23)
1
Supination and pronation refer to up and down movements of the foot at the ankle.
1
Answer:
1
FALSE
1
Diff: 2
1
Page Ref: 202
1
Matching
1
Match the following:
1
1)
1
The distance between two Z discs
1
A)
1
I band
1
Diff: 2
1
Page Ref: 187-188
1
B)
1
myosin filaments
1
2)
1
Otherwise known as thick filaments
1
C)
1
actin filaments
1
Diff: 2
1
Page Ref: 189
1
D)
1
Z discs
1
3)
1
Contains only the actin filaments
1
E)
1
sarcomere
1
Diff: 2
1
Page Ref: 187-188
1
F)
1
H zone
1
4)
1
Both actin and myosin are found in this band
1
G)
1
A band
1
Diff: 1
1
Page Ref: 187-188
1
5)
1
The type of filament that is studded with myosin heads
1
Diff: 1
1
Page Ref: 189
1
6)
1
Tiny contractile unit that shortens during muscle contraction
1
Diff: 2
1
Page Ref: 187; 192
1
7)
1
Actin filaments are anchored to these disclike membranes
1
Diff: 1
1
Page Ref: 189
1
8)
1
Lighter central portion of the A band
1
Diff: 2
1
Page Ref: 187
1
1)
1
E
1
2)
1
B
1
3)
1
A
1
4)
1
G
1
5)
1
B
1
6)
1
E
1
7)