Integemantary System

Question 1

Epidermis

Answer 1

1st layer. The outer layer of cells. Filled with keratin and composed of dead cells. Acts as a water proof protective layer.

Question 2

Dermis

Answer 2

2nd layer composed of living cells. THis includes sensory neurons, blood vessels, muscle fibres, hair follicles, and glands (including sweat and oil glands)

Question 3

Hypodermics (subcutaneous)

Answer 3

3rd layer. Composed of fat cells. Functions as energy reserve, shock absorber and insulator

Question 4

Functions of the skin

Answer 4

1. Regulates body temperature
2. Prevents fluid loss
3. Rids body of waste (through sweat)
4. Protection

Question 5

Apocrine glands

Answer 5

Develops in areas with list of hair. Starts around puberty. Only about 200 of these glands.
Ex. Armpit

Question 6

Eccrine glands

Answer 6

Covers the rest of the body. Open directly onto the surface of the skin.
Ex. Palms, forehead, feet

Question 7

Melanin

Answer 7

Brown pigment that occurs in the hair and skin. It is responsible for tanning of skin exposed to sunlight.

Question 8

Why do concentrations of melanin vary in populations in different locations around the world?

I.e. The equator vs. Northern countries

Answer 8

Near the equator people are closer to the sun, which means more melanin is being produced in the skin. Which in return acts as a protective barrier against the suns rays. This cause people in these areas to have a darker skin pigment.

Question 9

Thick skin

Answer 9

Found in areas where skin comes in contact with different textures and objects.
Ex. Hands and feet.

Question 10

Thin skin

Answer 10

Just not tough enough

Ex. Belly, chin, back honestly anywhere.

Question 11

BONUS

What layer of the skin does tattoo ink stay in?

Answer 11

THE DERMIS

Question 12

How does the skin regulate body temperature?

Answer 12

1. Sweating
2. Goosebumps
3. Shivering