3
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
Muscle contraction
Muscle contraction is the tightening, lengthening or shortening of muscles induced by action potential transmitted by the nerves. Motor neurons are responsible for the transmission of nerve impulse from the central nervous system to the muscle fibers.
Role of calcium ions in muscle contraction
Upon receiving electrical signals, the neurotransmitters present in neurons are released and bind to the sarcolemma of the muscles. This generates an action potential across muscle fibres which induce the release of calcium ions from sarcoplasmic reticulum. Calcium ions bind to troponin (protein present in actin filament) and cause conformational change. This finally leads to muscle contraction.
Final answer
(D) Sarcoplasmic reticulum
Muscle contraction
Muscle contraction is the tightening, lengthening or shortening of muscles induced by action potential transmitted by the nerves. Motor neurons are responsible for the transmission of nerve impulse from the central nervous system to the muscle fibers.
Role of calcium ions in muscle contraction
Upon receiving electrical signals, the neurotransmitters present in neurons are released and bind to the sarcolemma of the muscles. This generates an action potential across muscle fibres which induce the release of calcium ions from sarcoplasmic reticulum. Calcium ions bind to troponin (protein present in actin filament) and cause conformational change. This finally leads to muscle contraction.
Final answer
(D) Sarcoplasmic reticulum
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