The Integumentry System

Question 1

3 layers of the skin

Answer 1

1.Epidermis
2.Dermis
3. Subcutaneous layers (hypodermis)

Question 2

Function and component of the system

Answer 2

Protects body from damage, includes hair,scales,feathers, hooves and nails, glands and skin.

Question 3

Epidermis

Answer 3

-Waterproof, outer layer which keeps pathogens out of the body
-it is elastic and gives the skin colour

Question 4

Dermis

Answer 4

-middle layer which contains hair follicles, nerves, blood vessels and glands to help regulate body temperature

Question 5

Subcutaneous layer

Answer 5

Made of connective tissue and has a high amount of fat which provides insulation and shape

Question 6

Skin glands

Answer 6

Sudoriferous
Sebaceous
Ceruminous

Question 7

Sudoriferous

Answer 7

Secretes sweat

Question 8

Sebaceous

Answer 8

Secretes sebum which keeps hair and skin lubricated

Question 9

Ceruminous

Answer 9

Specialised sudoriferous glands that secrete earwax

Question 10

Downy hair

Answer 10

-Dense, fine, soft hairs which lie close to the skin making up the undercoat
-Good for insulation

Question 11

Guard hair

Answer 11

-Coarser,thicker, longer hairs make up the top coat
-Help prevent injuries to the skin and influences the animal appearance
-Each guard hair is surrounded by 6-12 downy hairs

Question 12

Nails, claws and hooves

Answer 12

Nails- a nail matrix forms on top of the dermis. The root of the nail grows from a thick layer of matrix
Claws and hooves- made of a selection of the dermis which is covered in a layer of keratinised epithelium

Question 13

Horns and antlers

Answer 13

Made from different things in different species
Hollow horns- eg goats and sheep are made from a cone of keratin which surrounds a mass of bone. Rhino horns are different because they are made from keratinised cells without a core bone
Antlers- made of bone, young antlers are covered in velvety skin which is rubbed off as the antlers develop, the bone turns into compact bone tissue as they mature