Zoology-Muscle Contraction
NEET Zoology Muscle Contraction MCQ Question
Type: MCQ-conceptual-Easy-Class 11
Which of the following statements about muscle contraction are correct?
A
Calcium ions bind to troponin, exposing myosin binding sites on actin.
B
Muscle contraction is a voluntary process only in skeletal muscles.
C
Myosin filaments are composed of polymerized globular proteins called meromyosins.
D
Actin filaments are masked in the resting state by a subunit of myosin.
Correct Answer
Option A
Detailed Explanation
Statement A is correct as calcium ions bind to troponin, allowing myosin to attach to actin. Statement B is incorrect as cardiac muscles are also involuntary. Statement C is correct regarding the structure of myosin. Statement D is incorrect because it is a subunit of troponin that masks the binding sites on actin, not myosin.
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