Synapse and Neurotransmitters Practice Questions

Question 1

What is a synapse?

Accepted Answer

The junction between two neurons or between a neuron and an effector cell (e.g., muscle or gland cell), where electrical or chemical signals are transmitted.

Question 2

Name the three main components of a chemical synapse.

Accepted Answer

Presynaptic terminal, synaptic cleft, and postsynaptic membrane.

Question 3

What is the primary function of neurotransmitters?

Accepted Answer

To transmit signals across a chemical synapse from one neuron to another target cell.

Question 4

Describe the process of neurotransmitter release at the presynaptic terminal.

Accepted Answer

When an action potential arrives at the presynaptic terminal, voltage-gated calcium channels open, leading to an influx of Ca2+. This influx triggers the fusion of synaptic vesicles (containing neurotransmitters) with the presynaptic membrane, releasing neurotransmitters into the synaptic cleft.

Question 5

How do neurotransmitters exert their effects on the postsynaptic neuron?

Accepted Answer

They bind to specific receptors on the postsynaptic membrane, causing ion channels to open or close, which leads to either excitation (depolarization) or inhibition (hyperpolarization) of the postsynaptic neuron.

Question 6

Differentiate between excitatory and inhibitory neurotransmitters.

Accepted Answer

Excitatory neurotransmitters (e.g., acetylcholine, glutamate) depolarize the postsynaptic membrane, making it more likely to fire an action potential. Inhibitory neurotransmitters (e.g., GABA, glycine) hyperpolarize the postsynaptic membrane, making it less likely to fire an action potential.

Question 7

Name two common neurotransmitters and their primary functions.

Accepted Answer

1. Acetylcholine: Involved in muscle contraction, learning, memory. 2. Dopamine: Involved in reward, motivation, motor control. 3. Serotonin: Involved in mood, sleep, appetite. 4. GABA: Primary inhibitory neurotransmitter in the brain. 5. Glutamate: Primary excitatory neurotransmitter in the brain.

Question 8

What mechanisms are involved in the removal or inactivation of neurotransmitters from the synaptic cleft?

Accepted Answer

1. Enzymatic degradation (e.g., acetylcholinesterase breaking down acetylcholine). 2. Reuptake into the presynaptic neuron or glial cells. 3. Diffusion away from the synaptic cleft.

Question 9

What is the role of calcium ions in synaptic transmission?

Accepted Answer

Calcium influx into the presynaptic terminal triggers the release of neurotransmitters from synaptic vesicles.

Question 10

Explain the concept of summation in postsynaptic potentials.

Accepted Answer

Summation is the process by which multiple postsynaptic potentials (EPSPs or IPSPs) combine to reach the threshold for an action potential. It can be temporal (multiple signals from one neuron over time) or spatial (multiple signals from different neurons at the same time).

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