Ans 214 SI Session 6

AnS 214 SI Session 6

Sunday 2/7, 7pm

CQoD: “The right half of the brain controls the left half of the body. This means that only left handed people are in their right mind.” - Author Unknown

A. Elements of the nervous system.

1) Fill in the diagram at right with the components of the nervous system hierarchy.

2) Ganglia belong where on this diagram? Nuclei?

3) List the three basic neuron types involved in sensory to motor response and note their location in the diagram.

1.S______:

2.I______:

3.M______:

4) Name and define the 3 properties of neurons:

1.E______:

2.C______:

3.S______:

5) Label the parts of the neuron at right.

6) ______can be fast and slow, and is involved in the transfer of particles from the soma to the axon. The reverse of this process is called ______, and serves to returned used vesicles and inform the soma of axonal conditions. Pathogens can exploit ______in order to carry out infection. ______flow is a slow form of anterograde transport used to gradually replenish enzymes and cytoskeletal components, as well as playing a role in neuron ______.

7) Fill in the table below by matching the neuroglial type to its function and denoting its location (CNS/PNS) in the nervous system.

Name / Function / Locations
Secrete CSF.
Macrophages of the nervous system.
Myelinate axons of peripheral nerves.
Form blood-brain barrier, form supportive network.
Myelinate axons of the nuclei.

8) The majority of neuron in the body are ______. They constitute ______% of the neuron population.

B. Resting membrane potential and intro to action potentials.

1) What is the magnitude of RMP for most neurons?

2) Other than neurons, what other cell type is considered excitable?

3) Explain how the Na/K pump serves to create and maintain resting membrane potential.

4) What intrinsic property of cell construction contributes to overall negative charge?

5) In a resting cell, ______is high in the extracellular fluid, while ______is high inside the cell. Because ions in a solution tend to move down their ______gradients, Na wants to ______the cell, while K wants to ______the cell.

6) What is the charge on Na ions? K ions?

7) What would happen to RMP, if a large volume of Na were to enter the cell?

8) What would happen to RMP if a large volume of K were to exit the cell?

9) Which of the above two possibilities needs to occur in order to generate an action potential?

Where in the soma must this occur?

11) What other ion, concentrated in the ECF, commonly plays a role in changing RMP, and how does it influence RMP?