Skeleton Joints And Muscles

Question 1

4 functions of the skeleton

Answer 1

Protection
Shape
Movement (muscles can pull on bones which moves them)
Blood cell production (inner part of some bones produce blood cells)

Question 2

What is a joint?

Answer 2

Where bones meet

Can allow movement in different directions

Question 3

Hinge joint

Answer 3

Single plane movement eg Extension and Flexion (forward and back)
Eg elbow and knee

Question 4

Ball and socket

Answer 4

Flexion and extension , rotation (on an axis) , adduction and abduction (in and out) circumduction (can draw a circle)
Eg shoulder and hip

Question 5

Basic structure of a long bone

Answer 5

Cartilage - reduces friction and absorbs compression
Compact bone- hard , strong outer layer of the bone
Bone marrow- stores fat and makes red blood cells
Spongy bone- strong, lightweight inner layer of bone
Bone end- forms joint with another bone

Question 6

Major muscles in the body

Answer 6

• pectorals
  -biceps
  -abdominals
  -quadriceps
  -triceps
  -hamstring
  -calf
  Btw these are only SOME of them, we don’t have to know all

Question 7

Antagonistic muscles

Answer 7

As one muscle contracts the other relaxes
Eg
In flexion, biceps contract and raise the forearm as triceps relax
In extension, the triceps contract and lower as biceps relax