Question 1

Which of the following best describes the role of the synaptic cleft in chemical synaptic transmission?

Accepted Answer

It is a fluid-filled gap that separates the presynaptic and postsynaptic neurons, allowing neurotransmitters to diffuse across and bind to receptors.

Question 2

A postsynaptic neuron receives both excitatory and inhibitory inputs. Which of the following will most likely result in the generation of an action potential?

Accepted Answer

The sum of EPSPs brings the membrane potential to threshold, overcoming the IPSPs.

Question 3

Which of the following is TRUE regarding acetylcholine (ACh) at synapses?

Accepted Answer

ACh can be either excitatory or inhibitory depending on the receptor type and tissue.

Question 4

Which of the following best describes temporal summation?

Accepted Answer

A single presynaptic neuron fires rapidly in succession, causing postsynaptic potentials to add together.

Question 5

Which equation best represents the threshold condition for action potential generation in a postsynaptic neuron?

Accepted Answer

$$\sum EPSP - \sum IPSP \geq V_{threshold}$$

Question 6

A patient is given a drug that blocks voltage-gated calcium channels at the axon terminal. What is the most likely effect on synaptic transmission?

Accepted Answer

Neurotransmitter release will be inhibited, reducing synaptic transmission.

Question 7

Which of the following is a characteristic of channel-linked receptors at the synapse?

Accepted Answer

They mediate rapid synaptic transmission by directly opening ion channels.

Question 8

Which type of neuronal circuit is most likely involved in rhythmic activities such as breathing?

Accepted Answer

Reverberating (oscillating) circuit

Question 9

A postsynaptic neuron is exposed to a neurotransmitter that causes hyperpolarization. What is the most likely effect?

Accepted Answer

An inhibitory postsynaptic potential (IPSP) is generated, making the neuron less likely to fire.

Question 10

Which of the following best describes spatial summation?

Accepted Answer

Multiple presynaptic neurons fire at different locations on the postsynaptic neuron at the same time.

Question 11

Which of the following is TRUE about G protein–linked receptors at the synapse?

Accepted Answer

They cause the formation of intracellular second messengers, leading to slower but longer-lasting effects.

Question 12

Which of the following best explains why a single EPSP is usually insufficient to trigger an action potential in the postsynaptic neuron?

Accepted Answer

The EPSP is too small to depolarize the membrane to threshold.

Question 13

Which of the following is an example of a real-life application of summation in the nervous system?

Accepted Answer

A person quickly withdrawing their hand from a hot surface due to the combined effect of multiple sensory inputs.

Question 14

Which of the following best describes the function of a neuronal pool?

Accepted Answer

A functional group of neurons that integrate incoming information and forward the processed information to other destinations.

Question 15

Which of the following is the correct sequence of events at a chemical synapse?

Accepted Answer

Action potential arrives at axon terminal → Calcium channels open → Neurotransmitter released → Neurotransmitter binds to postsynaptic receptors

Question 16

Which of the following best describes the effect of an excitatory neurotransmitter on the postsynaptic membrane?

Accepted Answer

It causes depolarization, moving the membrane potential closer to threshold.

Question 17

A patient has a mutation that prevents the formation of synaptic vesicles in presynaptic neurons. What is the most likely consequence?

Accepted Answer

Neurotransmitters will not be released into the synaptic cleft, impairing synaptic transmission.

Question 18

Which of the following best describes the difference between graded potentials and action potentials?

Accepted Answer

Graded potentials can summate, while action potentials are all-or-none phenomena.

Chapter 11C: Synapses and Neural Integration – Nervous System and Nervous Tissue

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