NEET UG 2018 · Zoology · Question 168
NEET 2018 Zoology, question 168
Question 168 of the NEET 2018 paper (code AA) is a Zoology question from Locomotion and Movement. Its idea, Role of Calcium Ions, was asked only this once in NEET 2017–2026. The CBSE official answer key gives option 3.
Updated 2026-10-08
Q168 · Zoology
Calcium is important in skeletal muscle contraction because it
- 1detaches the myosin head from the actin filament.
- 2activates the myosin ATPase by binding to it.
- 3binds to troponin to remove the masking of active sites on actin for myosin.Official answer
- 4prevents the formation of bonds between the myosin cross bridges and the actin filament.
Official answer: option 3 · CBSE official answer key
Same idea
The only question on Role of Calcium Ions
No other NEET paper from 2017–2026 tested this exact idea.
The chapter
Locomotion and Movement in ten years of NEET
19 questions from 2017–2026, asked in 9 of 10 papers, about 1.8 a paper. Sliding Filament Theory alone had 4.