Question Detail

ZOO 101 ZOO 101 Past Questions Objective Question
Take CBT

Question

What initiates the exposure of binding sites on actin during muscle contraction?
Options
A Breakdown of ATP
B Binding of acetylcholine
C Release of calcium ions from sarcoplasmic reticulum
Correct Answer
D Action potential on the sarcolemma
Correct Answer

Option C is the correct answer.

Detailed Explanation

Calcium ions bind to troponin, causing a conformational change that shifts tropomyosin away from the myosin-binding sites on actin, allowing cross-bridge formation.

Hint

This ion acts as the key that unlocks the binding sites.

Question Info

Course: ZOO 101
Topic: ZOO 101 Past Questions
Type: Objective
Difficulty: Not specified
Question 78 of 2214
Previous Course Details Next