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In old age stiffness of joints is due to the –
Total number of movable bones (excluding hyoid) in human skull are
Actin protein occurs in two forms
Following is the store house of calcium in muscles
Which of the following pairs, is correctly matched?
DIRECTIONS : Each questions contain STATEMENT-1 (Assertion) and STATEMENT-2 (Reason).Each question has 4 choices (a), (b), (c) and (d) out of which ONLY ONE is correct.
Statement 1 : Muscle contraction force increases with rise in strength of stimulus.
Statement 2 : This is due to increased contraction of individual muscle fibres with increase in stimulus strength.
The muscle fibre always contracts with the maximum force and this force doesn't rise on increasing the strength of the stimulus. If the stimulus is of strength below the threshold, then the muscle fibre doesn't contract at all.This is known as All or None law. But the entire muscle doesn't obey this law, it means that force of contraction of muscle increase with rise in strength of the stimulus.This is due to the fact that the strength of the threshold stimulus varies from muscle fibre to muscle fibre in a muscle.