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Question
On stimulation of skeletal muscle, calcium is immediately made available for binding to troponin from
On stimulation of skeletal muscle, calcium is immediately made available for binding to troponin from
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Solution
The correct option is D Sarcoplasmic reticulum
- A neural signal reaching this junction releases a neurotransmitter (Acetylcholine) which generates an action potential in the sarcolemma. This spreads through the muscle fibre and causes the release of calcium ions into the sarcoplasm from the sarcoplasmic reticulum.
- Active sites for myosin are present on actin which are masked by troponin-C in resting state. When Ca++ level increases it leads to the binding of calcium with a subunit of troponin i.e Troponin-C on actin(thin) filaments and thereby remove the masking of active sites for myosin.
- Hence on stimulation of skeletal muscle, calcium is immediately made available for binding to troponin from sarcoplasmic reticulum.
- So, the correct answer is 'Sacroplasmic reticulum'.
- A neural signal reaching this junction releases a neurotransmitter (Acetylcholine) which generates an action potential in the sarcolemma. This spreads through the muscle fibre and causes the release of calcium ions into the sarcoplasm from the sarcoplasmic reticulum.
- Active sites for myosin are present on actin which are masked by troponin-C in resting state. When Ca++ level increases it leads to the binding of calcium with a subunit of troponin i.e Troponin-C on actin(thin) filaments and thereby remove the masking of active sites for myosin.
- Hence on stimulation of skeletal muscle, calcium is immediately made available for binding to troponin from sarcoplasmic reticulum.
- So, the correct answer is 'Sacroplasmic reticulum'.
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