NEET UG BIOLOGY MCQ: LOCOMOTION AND MOVEMENT

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Analyzing +4 | -1

Select the option which contains only the incorrect statements w.r.t sliding filament theory of muscle contraction.

a. Acto-myosin cross bridge breaks as a new ATP binds to the myosin head

b. Binding of

{Ca}^{++}

to troponin results in masking of myosin binding site on actin

c. A-bands get reduced during shortening of the sarcomere

d. Actin filaments slide past myosin filaments

View answer and explanation

Correct option: B

b and c

Option D (A and R are incorrect) is correct because during muscle contraction, the length of the A-band remains constant, and the length of the I-band decreases. The contractile proteins do not decrease in size.

More Questions from LOCOMOTION AND MOVEMENT

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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.