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Which of the following ions binds to the troponin complex, initiating contraction of a muscle?

A. Calcium

B. Phosphorus

C. Sodium

D. Potassium

Answer Explanation:

Calcium ions bind to troponin complex, which initiates the contraction of a muscle.

Therefore, the Correct Answer is A.

Q #1: Which of the following ions binds to the troponin complex, initiating contraction of a muscle?

A. Calcium

B. Phosphorus

C. Sodium

D. Potassium

Answer Explanation

Calcium ions bind to troponin complex, which initiates the contraction of a muscle.
Q #2: Which is moved the least during muscle contraction?

A. the origin

B. the insertion

C. the ligaments

D. the joints

Answer Explanation
Q #3: What is the largest muscle in the lower leg?

A. soleus

B. gastrocnemius

C. tibialis anterior

D. tibialis posterior

Answer Explanation

The largest muscle in the calf is called the gastrocnemius. This muscle is responsible for plantar flexion of the foot and lies superficial to the soleus muscle in the calf.

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