Zoology-Muscle Contraction
NEET Zoology Muscle Contraction Assertion Reason Question
Type: Assertion Reason-assertion-Medium-Class 11
Assertion (A): The presence of calcium ions in the sarcoplasm is essential for muscle contraction. | Reason (R): Calcium ions bind to troponin, causing the removal of the masking of active sites on actin filaments.
A
Both A and R are true and R is the correct explanation of A.
B
Both A and R are true but R is not the correct explanation of A.
C
A is true but R is false.
D
A is false but R is true.
Correct Answer
Option A
Detailed Explanation
Calcium ions bind to a subunit of troponin on actin filaments, which is essential for muscle contraction as it removes the masking of active sites for myosin.
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