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9. Elaborate the freely movable joints in detail.

Freely Moveable or Freely Moveable or Synovial joints: Include most of the types of
joints of the body. Bones are covered with the hyaline cartilage & are surrounded by a
fibrous articular capsule which is strengthened by ligaments.
These freely movable joints are further classified into Six categories:

(a)Gliding joints

(b)Hinge joints
(c)Condyloid joints
(d)Saddle joints
(e)Ball & socket joints
(f)Pivot joints (Explain)

10. Discuss the function and properties of muscles.

I. Muscle contractions usually carry out one of the two things—either they maintain a
posture or they cause movement.

2. Skeletal muscles provide the force for movement of the skeletal system. These
muscles perform movements at our will.
3. Cardiac muscles perform pumping action of the heart.

4. Smooth muscles are concerned with the movements of internal organs, such as those
of the stomach, intestines, visceral and blood vessels.
5. The two types of skeletal muscle fibres, i.e., slow twitch fibres and fast twitch fibres

perform different types of functions. Slow twitch fibres contract at a slow rate, These
fibres play a vital role in endurance activities or aerobic activities, such as in cross

country race or long distance races. The fast twitch fibres contract at a fast rate. These
fibres produce explosive power. These fibres perform fast repetitive contractions. These

fibres are usually at work in 100 m race or sprint races, high jump, weightlifting,
basketball, football, etc. These fibres play a vital role while performing anaerobic

activities.
6. Muscles also provide shape to the human body.

7. Some muscles help in increasing the range of movements.

8. Big muscles provide protection to the bones.