NEET Zoology Muscle Contraction Assertion Reason Question
Assertion (A): Calcium ions are released into the sarcoplasm upon receiving a neural signal.
Reason (R): Calcium binds with tropomyosin to expose active sites on actin filaments.
Both A and R are true and R is the correct explanation of A.
Both A and R are true but R is not the correct explanation of A.
A is true but R is false.
A is false.
Correct Answer
Detailed Explanation
The assertion is true as calcium ions are indeed released into the sarcoplasm upon receiving a neural signal. However, the reason is false because calcium binds with a subunit of troponin, not tropomyosin, to expose active sites on actin filaments.
Found an issue with this question?
Related Questions
More from Muscle Contraction
During muscular contraction, which of the following events occur? (i) H⁻zone disappears (ii) A⁻band widens (iii) I⁻band reduces in width (iv) ...
If a muscle fibre contains 150 sarcomeres between two Z lines and each sarcomere shortens by 0.6 micrometers during contraction, what is the total sho...
More from
Assertion (A): Ciliary movement in human beings is limited to internal tubular organs. | Reason (R): Ciliary movement facilitates the passage of ova i...
Match Column-I with Column-II. Column-I Column-II (a) Amoeboid movement (i) Tentacle contraction (b) Ciliary movement (ii) Locomotio...