Unit 1D & 1E Worksheet
Unit 1D & 1E Worksheet
1) Somites, are one of the ___ specialized groups of______, and are lusters of cells, _____pairs, that are made up of ______which produce ______and ribs. ______which help form ______skin dermis and ______which form skeletal muscle of the______, trunk, and______.
2) ______Mesoderm forms gonads, which are ______or ______along with kidneys.
3) Lateral mesoderm is made up of ______and ______mesoderm.
4)The somatic ______forms the ______of the ventral skin, ______serosa of ventral body cavity along with______, ligaments and ______of limbs.
5) Splanchnic ______forms ______and blood ______and most ______tissues of the body.
6) Placenta forms from embryonic ______tissues and maternal ______tissues.
7) Chorion develops fingerlike villi that become ______and extend to the embryo as umbilical ______and______, it also helps forms the placenta by ______the embryonic body and all other membranes.
8) Functions of the skin are:a barrier or ______, temperature______, ______, metabolism in the ______of Vitamin D, blood ______and limited______.
9) Skin consists of two major regions the______, the outer most and the______, the middle region and the layer beneath is referred to as the ______or superficial______.
10) Epidermis is composed of______epithelium, and the dermis and hypodermis are composed of ______tissue.
11) As cells of the epidermis, ______produce the fibrous protein keratin, and melanocytes which produce the brown pigment______, but skin also gets its color from ______and blood vessels.
12) Langerhans cells are epidermal ______that help activate the ______system, while tactile cells such as ______cells functions as touch ______in association with ______nerve endings.
13) Stratum ______which is the base layer or ______epidermal layer which is attached to the______. Here the youngest ______cells undergo rapid division called ______to regenerate the superficial layers.
14) The next layer up is the Stratum______, which gets its name due to the web-like system of the cells which has pre-keratin ______attached to ______which gives it a “prickly look. In this layer ______granules and ______cell are abundant.
15) This middle layer is the Stratum ______a thin layer with only __ to __ layers of cells which are ______and organelles are______. It gets its name due to the ______and ______granules accumulating in the granulosum cells and this provides______.
16) Second from the top is the Stratum ______or clear layer which is thin and ______and consists of a few layers of flat dead ______and is present only in thin /thick skin.
17) The very top or outer most layeris the Stratum ______or the Horny Layer, of ______cells meaning the cell’s ______and organelles are replaced by keratin ______which is left as the cells die. This layer provides most of the ______thickness.
18) The functions of the epidermis are______, protection from ______and______.
19) Dermis is vascular and ______and has two regions, superficial also called ______and deep also called______.
20) The ______region is loose ______connective tissue, and the dermal papillae which are finger like ______into the epidermis and have ______endings that detect______, touch and ______have increased ______vessels and modified______. Vitamin D is ______here.
21) The reticular region is composed of ______connective tissue in which ______and elastic fibers run ______to skin’s surface, and the spaces are filled with ______tissue.
22) Also found in the dermis are ______follicles, ______from deeper tissues, ____glands, ducts nerve ______and sensory______.
23) The superficial ______or hypodermis which covers the ______under the skin has ______from the dermis that ______the skin to deeper______and______.
24) Skin derivatives ______from the epidermis such as______, hair and ______but their growth takes place in the______.