Skeletal And Muscular System - Biology

Question 1

How many bones are in the body?

Answer 1

Adult : 206

Children : a lot more

Question 2

Cartilage

Answer 2

Cartilage acts like a shock absorber and allows limited movement as to stop bones rubbing of eachother.

Question 3

Joint

Answer 3

A joint is where two bones meet.

Question 4

Fused or Fixed joint

Answer 4

Does not allow bones to move, appear as if they have been stitched together.
Eg. Skull

Question 5

Synovial joints

Answer 5

• Synovial joints allow the bones to move •

type one : ball and socket joints
type two : hinge joints

Question 6

Ball and socket joints (synovial joint)

Answer 6

Ball and socket joints allow movement in several directions.

Eg. Hips and shoulders

Question 7

Hinge joints (synovial joint)

Answer 7

Allows movement in one plane only.

Eg. Knee, elbow, jaw, knuckles

Question 8

Ligaments

Answer 8

Ligaments are tough elastic fibres that hold the bones together.

Question 9

Synovial fluids

Answer 9

Synovial fluid acts as a shock absorber, allowing bones to move and prevent friction.

Question 10

Tendons

Answer 10

Tendons anchor muscles to bone. When the muscle contracts the joints and tendons bend and the bone moves.

Question 11

Antagonistic pairs

Answer 11

The muscles can only contract (get shorter) and they can only pull bones. The biceps contract to pull up the lower arm, the triceps contract to pull down the lower arm.

Question 12

What are the functions of the skeleton?

Answer 12

1. To support the body
2. To allow movement
3. To protect organs