1.
Option A
2.
Option B
3.
Option A
4.
Option A
5.
Option A
6.
Option B
7.
A joint is junction where two or more bones meet. Uses of joints are bending, stretching, twisting and turning easily. Most of our joints can move only in certain directions.
8.
Option C
9.
Option A
10.
Functions of skeleton are support, movement, protection, production of blood cells, warehouse of important minerals.
11.
Option A
12.
Pivot joints connects the skull and spine. It allows head to rotate and also moves upwards-downwards.
13.
Option A
14.
Option B
15.
1.They provide structural support and protect various organs of the body. 2. They provide red blood cells. 3. They enable mobility by acting as levers and points of attachment for muscles. 4. They act as storage for calcium and phosphorus, essential minerals for various cellular activities throughout the body.
16.
There are two types of joints: 1.Immovable joint/ fixed joint- is a place in the body where two bones are joined together but show very little or no movement. eg.joints between the bones of the skull, joints in the pelvis and joints between the teeth and the mandible, or lower jaw, and the maxilla, or upper jaw. 2.Movable joint- provide free movement to the body. e.g.. joints present in arms, leg, hip and shoulder. Cartilage is found within all movable joints which make movements easier.
17.
Option D
18.
Option B
Solution:
Spine is made up of 33 bones.
19.
1. Hinge joints- e.g.. knees, elbows 2. Ball and socket joint- e.g.. femur and upper bone. 3. Pivot joint- e.g.. the joint at the neck and skull 4. Sliding joint- e.g.. wrist and ankles.
20.
The muscles in the forearm help the wrist to extend, rotate, and flex.
