Question

Which of the following directly or indirectly determines the amount of neurotransmitter released at the axon terminal of the sensory neuron?

1) the strength of the stimulus applied to the sensory receptor
2) the frequency of action potential at the sensory receptor
3) the amount of calcium that enters the sensory receptor
4) all of the above play a role in determining the amount of neurotransmitter released

Answer 1

The amount of neurotransmitter released at the axon terminal of the sensory neuron is determined by the strength of the stimulus, the frequency of action potential at the sensory receptor, and the amount of calcium that enters the sensory receptor.

Step-by-step explanation:

The amount of neurotransmitter released at the axon terminal of the sensory neuron is determined by various factors. In this case, all of the options mentioned play a role in determining the amount of neurotransmitter released.

1. The strength of the stimulus: A stronger stimulus applied to the sensory receptor will result in a larger amount of neurotransmitter being released.
2. The frequency of action potential: A higher frequency of action potential at the sensory receptor will lead to more neurotransmitter being released.
3. The amount of calcium: Calcium ions entering the sensory receptor play a crucial role in the release of neurotransmitters. When an action potential reaches the axon terminal, voltage-gated calcium channels open and allow calcium ions to enter, triggering the release of neurotransmitter.