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Nerve Impulse Conduction

What cause mu...

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What cause muscle relaxation? (a) binding of ATP with myosin filament. (b) influx of Ca ion into sarcoplasmic retoculum. (c)binding of ATP to actin filament.

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Q. During muscle contraction, the correct sequence of events is:

(A) Binding of myosin head to exposed active site of actin forming the cross-bridge by utilising the energy from hydrolysis of ATP

(B) Binding of

C a^{+ +}

with troponin of actin filaments and thereby removing the masking of active sites for myosin

(C) Releasing the ADP and Pi from myosin so it can go back to its relaxed state

(D) Release of acetylcholine at neuromuscular junction which generates action potential in the sarcolemma

Name the ion responsible for binding actin and myosin 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 :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.

A myosin molecule has________ ATP binding sites and ________actin binding sites

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