What is the role of calcium ions in muscle contraction? (2022)

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Question: What is the role of calcium ions in muscle contraction? (2022)

Options:

Correct Answer: To bind to troponin

Exam Year: 2022

Solution:

Calcium ions bind to troponin, causing a conformational change that allows myosin to bind to actin.

What is the role of calcium ions in muscle contraction? (2022)

What is the role of calcium ions in muscle contraction? (2022)

Step 1: When a muscle is stimulated to contract, calcium ions are released from the sarcoplasmic reticulum into the muscle cell.
Step 2: The calcium ions bind to a protein called troponin, which is located on the actin filaments.
Step 3: When calcium binds to troponin, it causes a change in the shape (conformational change) of the troponin complex.
Step 4: This shape change moves another protein called tropomyosin away from the binding sites on actin.
Step 5: With the binding sites on actin exposed, the myosin heads can now attach to actin.
Step 6: Once myosin binds to actin, it can pull on the actin filaments, leading to muscle contraction.

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