Assertion   :       Muscle contraction force increases with rise in strength of stimulus.

Reason      :       This is due to increased contraction of individual muscle fibres with increase in stimulus strength.

Assertion   :       Muscle as a whole doesn’t obey All or None law.

Reason      :       Each muscle fibre contracts maximally whenever it contracts.

Assertion   :       Non-striated muscles are said to be voluntary in nature.

Reason      :       Non-striated muscles can be moved according to will.

Assertion  :       Biceps and triceps are called antagonistic muscles.              

Reason     :     This is due to the fact that they contract and relax together.

Assertion  :       Triceps is said to be an extensor muscle for elbow joint.             

Reason     :     Triceps relaxes durings extension of forearm at the elbow joint.

Assertion   :       There are similarities between the locomotion of unicellular organisms and multicellular animal.

Reason      :       Ciliary, flagellar and amoeboid movement occur in unicellular organisms.

Assertion   :       Movement of body parts serves to change the body posture.

Reason      :       Body parts move in relation to body axis.

Assertion   :       Arthritis or inflammation of a joint makes the joint painful.

Reason      :       Some toxic substances are deposited at the joint.

Assertion   :       Ball and socket joints are the most mobile joints.

Reason      :       Synovial fluid is present here.

Assertion  :       Extra oxygen consumption in human body is known as oxygen debt.

Reason    :     The extra oxygen is required by the body to oxidise the accumulated lactic acid produced during strenous exercise.