Neuromuscular Junction

Q.

The Junction between a nerve cell and the motor unit is called

1. Gap junction
2. Tight junction

3. Neuromuscular junction

4. Sarcomeres

Q. Give brief description about pyruvate?

Q.

Which of the following is not correct?

1. Neuromuscular junction is between the motor neuron and muscle fibre

2. Acetylcholine is the Neurotransmitter

3. Acetylcholine binds to the receptor channels at the motor end of the plate of the muscles

4. The action potential causes the release of acetylcholine

Q.

Stimulation of a muscle fiber by a motor neuron occurs at

1. The neuromuscular junction

2. The transverse tubules

3. The myofibril

4. The sarcoplasmic reticulum

Q.

Read the following statements about muscle contraction in humans:

i. Chemical energy is converted into mechanical energy during muscle contraction

ii. Acetylcholineeasterase is an enzyme that catalyzes the production of acetylcholine

iii. In a contracted muscle, volume remains the same.

iv. A contracted muscle becomes shorter and thicker.

1. Only ii), iii) and iv) are correct.

2. Only iv) is correct.

3. Only i), iii) and iv) are correct.

4. Only i) and iv) are correct.

Q.

During an action potential, what is the role of calcium?

1. The calcium causes the release of acetylcholine in the neuron into the synaptic cleft.

2. There is no role for calcium during action potential.

3. The calcium breaks down ATP to ADP and inorganic phosphate.

4. The calcium binds to the myosin molecule in the sarcomere.