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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: Where is the temporalis muscle located?

A. on the forehead

B. in the neck

C. on the side of the head

D. on the chin

Answer Explanation

The temporalis muscle is a thin, fan-shaped muscle situated within the temporal fossa of the skull. Along with the medial pterygoid, lateral pterygoid and masseter muscles, it belongs to the group masticatory muscles.

The temporalis muscle runs superficially, from the temporal bone to the coronoid process of mandible.

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