Excercise 7 the Integumentary System

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REVIEW

NAME_________________________________

SHEET
EXERCISE

5.29.2012
LAB TIME/DATE _______________________

The Integumentary System
Basic Structure of the Skin
1. Complete the following statements by writing the appropriate word or phrase on the correspondingly numbered blank: Epidermis
The two basic tissues of which the skin is composed are dense irregular 1. _____________________________
connective tissue, which makes up the dermis, and 1 , which forms the epiKeratin dermis. The tough water-repellent protein found in the epidermal cells is called 2. _____________________________
2 . The pigments melanin and 3 contribute to skin color. A localized Carotene
concentration of melanin is referred to as a 4 .
3. _____________________________
Freckle
4. _____________________________
2. Four protective functions of the skin are
a.
b.

Protection
____________________________________________
Temperature regulation
____________________________________________

c.
d.

Prevents water loss
_________________________________________
minor excretory system
_________________________________________

3. Using the key choices, choose all responses that apply to the following descriptions. Key: a.
b.
c.

stratum basale
stratum corneum
stratum granulosum

d.
e.
f.

Stratum Lucidum
Stratum corneum & stratum lucidum
papillary layer
dermis as a whole
epidermis as a whole
stratum basale
stratum corneum
stratum spinosum
dermis as a whole
stratum basale
stratum basale

papillary layer

stratum lucidum
stratum spinosum
papillary layer

g. reticular layer
h. epidermis as a whole
i. dermis as a whole

1. translucent cells in thick skin containing keratin fibrils 2. dead cells
3. dermal layer responsible for fingerprints
4. vascular region
5. major skin area that produces derivatives (nails and hair) 6. epidermal region exhibiting the most rapid cell division
7. scalelike dead cells, full of keratin, that constantly slough off 8. mitotic cells filled with intermediate filaments
9. has abundant elastic and collagenic fibers
10. location of melanocytes and Merkel cells
11. area where weblike pre-keratin filaments first appear
12. region of areolar connective tissue

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4. Label the skin structures and areas indicated in the accompanying diagram of thin skin. Then, complete the statements that follow.

Hair Shaft

Stratum

Corneum

Stratum granulosum
Stratum Spinosum

Epidermis

Layers

Stratum Basale

nerve endings

hair follicle
Sebaceous gland
Melanocytes
Arrector pili muscle

Dermis

Reticular layer

Sweat gland
Blood vessel
Subcutaneous
tissue or

Hair Root

Hypodermis

Vein
Adipose cells

Pacinian Corpuscle
(deep pressure receptor)

a.

Lamellated

granules extruded from the keratinocytes prevent water loss by diffusion through

the epidermis.
b.
c.

Glands that respond to rising androgen levels are the sebaceous & apocrine

glands.

d.

Phagocytic cells that occupy the epidermis are called langerhans cells

.

e.

A unique touch receptor formed from a stratum basale cell and a nerve fiber is a merkel disc

f.

What layer is present in thick skin but not in thin skin? stratum lucidum

g.

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Fibers in the dermis are produced by fibroblasts

What cell-to-cell structures hold the cells of the stratum spinosum tightly together? demosomes

Review Sheet 7

.

.

5. What substance is manufactured in the skin that plays a role in calcium absorption elsewhere in the body?

Vitamin D
6. List the sensory receptors found in the dermis of the skin.

free nerve endings, messiners corpuscles, pacinian corpuscles

7. A nurse tells a doctor that a patient is cyanotic. Define cyanosis. What does its presence imply?

tissues near the skin surface are low on oxygen

8. What is a bedsore (decubitus ulcer)?
Why does it occur?

blue or purple color to the skin or...
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