Question

True or False. Action potential is generated and propagated along the sarcolemma and down the transverse tubules. Neurotransmitter is released and diffuses across the synaptic cleft and attaches to ACh receptors on the sarcolemma. Action potential triggers the release of Ca2 from the terminal cisternae of the sarcoplasmic reticulum.

Answer 1

Answer:

• Option- True

Explanation:

• Action potential is generated and propagated along the sarcolemma and down the transverse tubules. Neurotransmitter is released and diffuses across the synaptic cleft and attaches to ACh receptors on the sarcolemma. Action potential triggers the release of Ca2 from the terminal cisternae of the sarcoplasmic reticulum.

Answer 2

Answer:

False incorrect sequence.

Explanation:

1,Stimulus reaches the presynaptic  neuron membrane.

2.Calcium channels opens, and calcium ion diffuses into the neurone.

3.Vessicles of neurotransmitter acetycholine fused with the membrane of presynaptic neuron,   Neurotransmitter is released and diffuses across the synaptic cleft and attaches to ACh receptors on the sarcolemma.

4 The arrival of Action potential opens Na+ channels  in the sacolemma.

5, Na+ diffuses in causing depolarization  of the sacolemma,which  causes action potential to spreads along it length.

6. Action potential is generated and propagated along the sarcolemma and down the transverse tubules.

7. Action potential triggers the release of Ca2 from the terminal cisternae of the sarcoplasmic reticulum

8.Calciumion binds  to tropin, tropomyosin exposes the myosin-binding sites,cross-bridges is formed , and sacomere formed.