Holding It Together

Question 1

Three layers of skin

Answer 1

Upper layer-epidermis
(Ever-regenerating defense system)
Middle-dermis

Final layer-hyperdermis
(A cushion of fat that keeps us warm, protect bones, keeps us supplied with energy)

Question 2

Two types of skeleton

Answer 2

Axial skeleton: skull, spine, ribcage

Appendicular skeleton: upper and lower limbs, shoulder blade and pelvic girdle that attach them to the axial skeleton

Question 3

How bones grow

Answer 3

Bone growth is controlled by growth hormone, with additional growth spurt occurring in response to sex hormones at puberty.

Question 4

Joint structure

Answer 4

A joint forms where two bones come into close contact. Some joints are fixed, with the bones locked together, such as the suture joint in the adult skull. Some joints have a limited range of movement like the elbow, while others can move more freely like shoulder

Question 5

different types of teeth

Answer 5

Sharp-edged. Incisor cut and bite

Canines tear

Molar and premolars have flattened, ridged surfaces that chew and grind food into tiny pieces