Ch 2 Integumentary System

Question 1

Integumentary System(define)

Answer 1

part of body composed of SKIN AND UNDERLYING SUBCUTANEOUS TISSUE; largest organ ~15% body weight

Question 2

Functions of skin (5)

Answer 2

-protect underlying tissues
-site of sensory receptors
-regulation of body temp
-water excretion
-form vitamin D

Question 3

Layers (2)

Answer 3

Dermis and Epidermis, both lay on subcut tissue, thickest on back 1/2 cm, thinnest on eyelid 1/2 mm

Question 4

Epidermis (define/ components)

Answer 4

outermost layer composed of STRATIFIED SQUAMOUS KERATINIZED EPITHELIUM; avascular but has nerve endings and receptors

Question 5

Epidermis (function)

Answer 5

undergoes mitosis at outermost layer, desiccate, convert to keratin, and slough off~30days; contain melanocytes to make melanin which protects from UV light, keratin is thickest in palms and soles making papillary ridges = fingerprints

Question 6

Dermis (define/ components)

Answer 6

deep layer to the epidermis, 80% of skins thickness; DENSE IRREGULAR CONNECTIVE TISSUE; contains blood vessels and nerves, collagen, sweat glands, and hair follicles

Question 7

Subcutaneous Tissue

Answer 7

deeper than dermis; LOOSE CONNECTIVE TISSUE and ADIPOSE TISSUE; contain blood vessels, cutaneous nerves; more adipose tissue in females which insulates body, conserves heat, and is hock absorbent

Question 8

Associated Structures (define) / (5)

Answer 8

part of integument and serve a function;
-HAIR FOLLICLES
-SEBACEOUS GLANDS
-ARRECTOR PILORUM MUSCLES
-SWEAT GLANDS
-NAILS

Question 9

Hair follicles

Answer 9

grow down from epidermis into dermis and subcut tissue, formed by follicle cells undergoing mitosis, when follicle is inactive, hair is lost

Question 10

Sebaceous Glands

Answer 10

oil production from disintegration of gland cells; secretes sebum into neck of hair follicle

Question 11

Arrector Pilorum Muscle

Answer 11

smooth muscles attached to hair follicle at epidermal/dermal junction; contracts to cold weather to insulate body

Question 12

Sweat Glands

Answer 12

secrets in dermis, then travels to pore through epithelium, cools body as it evaporates

Question 13

Nails

Answer 13

protective structures of hard keratin on tips of fingers and toes

Question 14

Answer 14

epidermis

Question 15

Answer 15

dermis

Question 16

Answer 16

subcutaneous tissue

Question 17

Answer 17

dermis papilla

Question 18

Answer 18

sweat gland

Question 19

Answer 19

hair follicle

Question 20

Answer 20

hair shaft

Question 21

Answer 21

papilla of hair follicle

Question 22

Answer 22

sebaceous gland

Question 23

Answer 23

arrector pilarum muscle

Question 24

Answer 24

nerve

Question 25

Answer 25

blood vessel