NEET UG BIOLOGY MCQ: LOCOMOTION AND MOVEMENT

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Arrange the following steps of muscle contraction in the sequence of events occurring first I. Receptor sites on sarcolemma II. Nerve impulse III. Release of

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IV. Acetylcholine release V. Shortening of sarcomere VI. Synaptic cleft VII. Spread of impulse over sarcolemma on T-tubule The correct option is

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Correct option: A

II → IV → VI → I → VII → III → V

Option A (II → IV → VI → I → VII → III → V) is correct because it represents the correct sequence of events in muscle contraction, starting with a nerve impulse and ending with sarcomere shortening.

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What is the incorrect set of antagonistic muscles? Which one of the following is not a part of ear osicles?

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bind …A… in skeletal muscles and leads to the exposure of binding site for …B… on the filament …C…
Identify A, B and C, so as to complete the given statements Which is not the function of endoskeleton? Read the following statements about human skeleton system and choose the option that correctly states them true (T) and false (F).
a. Total number of bones in hind limbs are 60
b. There are 26 bones in vertebral column of an adult man
c. There are 2 pairs of vertebrochondral ribs
d. Axial skeleton is comprised of 80 bones
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.