Integumentry System

Question 1

Anatomy of the skin

Answer 1

1. Epidermis (5 layers in it)
2. Dermis
3. Subcutis
4. Accessory structures: glands, nails, hooves, beaks, wool, fur, feathers

Question 2

Epidermis

Answer 2

• Stratified SQ cells
• Without blood vessels, nerves, or glands in it

Question 3

Dermis

Answer 3

• Blood supply and nerves are present here
• Fibro-elastic framework (collagen)

Question 4

Function of Epidermis

Answer 4

• Waterproof skin
• Protection from chemicals and organisms
• Melanocyte pigment (melanin) protects the body from UV light

Question 5

Functions of Dermis

Answer 5

• Thermoragulation: dilation of capillaries, sweat production, and piloerection (“goosebumps”)
• Sense of touch

Question 6

Subcutis

Answer 6

Adipose and connective tissue

Question 7

Subcutis function

Answer 7

• Fat storage
• Strength & elasticity of skin

Question 8

Glands
Sebum & lanolin

Answer 8

• oils skin and fur
• elasticity
• waterproof
• Mirco-organism balance

Question 9

Glands
Pheromones

Answer 9

• circumoral glands of cats, peri anal glands of dogs

Question 10

Glands
Sweat

Answer 10

• cooling mechanism (for some animals)