Question

Proper functioning of a neuromuscular junction requires the a. presence of acetylcholine. b. presence of a synaptic cleft. c. presence of a motor terminal. d. sarcolemma of a muscle cell. e. All of these are correct.

Short answer

The proper functioning of a neuromuscular junction requires the presence of acetylcholine, a synaptic cleft, a motor terminal, and the sarcolemma of a muscle cell. Hence, the correct answer is e. All of these are correct.

Step-by-step solution

Understand the components.

Neuromuscular junction comprises various components, including acetylcholine, synaptic cleft, motor terminal, and sarcolemma. It's essential to understand the role of each component: a. Acetylcholine: It's a neurotransmitter that transfers signals between the motor neuron and muscle fiber. b. Synaptic cleft: The space between the motor neuron and muscle fiber, where the neurotransmitters are released. c. Motor terminal: It's the end of the motor neuron that releases acetylcholine into the synaptic cleft. d. Sarcolemma: It's the muscle fiber membrane that receives the signals from the motor neuron.

Analyze the requirements for proper functioning.

For a neuromuscular junction to function correctly, each component must work together: a. The presence of acetylcholine is crucial, as it transfers signals for muscle contraction. b. The presence of a synaptic cleft is necessary, as it facilitates signal transmission via chemicals. c. A motor terminal's presence is essential, as it releases acetylcholine to transmit the signal. d. The sarcolemma of a muscle cell is required, as it is the site of signal reception and activation of muscle contraction. Since all components need to be present for the proper functioning of a neuromuscular junction:

Select the correct answer.

All of these components are essential for the proper functioning of a neuromuscular junction. Therefore, the correct answer is: e. All of these are correct.