What triggers the release of calcium ions from the sarcoplasmic reticulum?

Formation of actin-myosin cross-bridges

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Sarcomere contraction

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An action potential

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An increase in calcium ion concentration

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Solution

The correct option is C An action potential
A motor neuron carries signal to the muscle fibre which generates an action potential in it. This causes the release of Ca++ from sarcoplasmic reticulum. Ca++ activates actin which binds to the myosin head to form a cross bridge. These cross bridges pull the actin filaments causing them to slide over the myosin filaments and thereby causing contraction.

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Similar questions

Q. Which muscle protein binds with calcium ions that are released from the sarcoplasmic reticulum?

During an action potential, calcium is released into the sarcoplasm, near the actin and myosin molecules. Which of the following is the best explanation of what the calcium does?

Q. Assertion :On stimulation, a muscle cell releases calcium ions (

C a^{2 +}

) from sarcoplasmic reticulum. Reason: By reacting with a protein complex,

C a^{2 +}

uncover active sites on the actin filaments.

Q. Assertion :Upon stimulation of a muscle cell, calcium ions

(C a^{+ +})

are released from the sarcoplasmic reticulum. Reason: In recating with a protein complex,

C a^{+ +}

uncover active sites on the actin filaments.

Q. Assertion :Assertion : On stimulation, a muscle cell releases calcium Ions

(C a l^{2 +})

from sarcoplasmic reticulum. Reason: Reason : By reacting with a protein complex,

C a l^{2 +}

uncover active sites on the actin filaments.

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