Ch 11 - Intro, anatomy and physiology

Question 1

What is the largest organ in the body?

Answer 1

integumentary system

Question 2

The integumentary system consists of 3 layers, what are they?

Answer 2

epidermis, the dermis or corium, and the hypodermis or subcutis

Question 3

The integumentary system serves several functions, what are they?

Answer 3

• provides a barrier against the outside world by preventing entry of pathogenic microoraganims and by protecting against physical and chemical insults
• it senses heat, cold, pain, touch, pressure, and other sensations like pruritus
• helps to regulates body temperature through mechanisms related to cutaneous blood flow, sweating, and the haircoat

Question 4

The ___ provides most of the thickness of the skin.

Answer 4

dermis

Question 5

The ____ is made up of keratinocytes, melanocytes, Langerhans cells, and Merkel cells.

Answer 5

epidermis

Question 6

The epidermis is comprised of 5 layers, what are they?

Answer 6

basal (deepest)
spinous
granular
clear
horny/cornified

Question 7

Epidermis is replenished in the ____ layer and pushed outward by newly formed layers.

Answer 7

basal

Question 8

What is the epidermis turnover rate?

Answer 8

when newly formed layers make their way to the surface (21 - 22 days then they flatten and harden to form a protective layer

Question 9

What is desquamation?

Answer 9

continual shedding of skin cells

Question 10

One type of sweat gland found only in foot pads is?

Answer 10

eccrine

Question 11

The hypodermis is the?

Answer 11

deepest layer

Question 12

The hypodermis’ function is?

Answer 12

to provide padding and insulation and to serve as an energy store

Question 13

There are 3 stages or phases of hair growth called?

Answer 13

anagen (growth)
telogen (rest)
catagen (intermediate)

Question 14

The hair cycle is controlled by?

Answer 14

• day-night length (photoperiod)
• environmental temperature
• hormones
• nutritional status