NEET UG BIOLOGY MCQ: LOCOMOTION AND MOVEMENT

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Assertion: In muscle contraction, length of both A – bands and I – bands decrease
Reason: Both myosin of A – bands and actin of I – bands are contractile proteins and decrease in size during muscle contraction

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Correct option: D

A and R are incorrect

Option B (b and c) is correct because statement b is incorrect as calcium binding to troponin unmasks the myosin binding site, and statement c is incorrect as A-bands remain constant during 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?

C{a^2}^ +

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.