Question 1

Which of the following best describes the primary difference between chemical and electrical synapses?

Accepted Answer

Chemical synapses rely on neurotransmitter release and receptor binding, while electrical synapses allow direct ion flow through gap junctions.

Question 2

During synaptic transmission at a chemical synapse, which ion's influx into the presynaptic terminal directly triggers neurotransmitter release?

Accepted Answer

Ca$$^{2+}$$

Question 3

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

Accepted Answer

EPSPs predominate and summate to reach threshold at the axon hillock.

Question 4

Which of the following mechanisms does NOT terminate neurotransmitter effects at a chemical synapse?

Accepted Answer

Continuous binding to postsynaptic receptors

Question 5

If a neurotransmitter binding opens chemically gated channels allowing simultaneous influx of Na$$^{+}$$ and efflux of K$$^{+}$$, what is the most likely postsynaptic effect?

Accepted Answer

Generation of an excitatory postsynaptic potential (EPSP)

Question 6

Which of the following best explains why synaptic delay is considered the rate-limiting step in neural transmission?

Accepted Answer

The process of neurotransmitter release, diffusion, and receptor binding takes more time than electrical conduction along the axon.

Question 7

A patient is exposed to a drug that blocks voltage-gated Ca$$^{2+}$$ channels in presynaptic neurons. What is the most likely physiological effect?

Accepted Answer

Decreased neurotransmitter release and impaired synaptic transmission

Question 8

Which property of muscle tissue allows it to return to its resting length after being stretched?

Accepted Answer

Elasticity

Question 9

Which of the following is NOT a function of muscular tissue?

Accepted Answer

Synthesizing neurotransmitters

Question 10

A single EPSP is usually insufficient to trigger an action potential in a postsynaptic neuron. Which process allows multiple EPSPs to combine and reach threshold?

Accepted Answer

Summation

Question 11

Which type of summation occurs when a postsynaptic neuron is stimulated by several presynaptic terminals simultaneously?

Accepted Answer

Spatial summation

Question 12

Which of the following best describes the microanatomy of a skeletal muscle fiber?

Accepted Answer

Cylindrical cell with many oval nuclei, abundant glycogen and myoglobin, and extensive sarcoplasmic reticulum

Question 13

Which of the following events occurs FIRST during information transfer across a chemical synapse?

Accepted Answer

Voltage-gated Ca$$^{2+}$$ channels open in the presynaptic terminal

Question 14

Which of the following would most likely result from opening chemically gated Cl$$^{-}$$ channels on the postsynaptic membrane?

Accepted Answer

Hyperpolarization and decreased likelihood of action potential

Question 15

Which functional characteristic of muscle tissue is defined as the ability to receive and respond to stimuli?

Accepted Answer

Excitability

Question 16

A muscle fiber is described as a syncytium. What does this mean?

Accepted Answer

It contains multiple nuclei within a single cell membrane.

Question 17

Which of the following is TRUE regarding electrical synapses?

Accepted Answer

They allow rapid, bidirectional communication via gap junctions.

Question 18

Which process is most responsible for the rapid termination of neurotransmitter effects in the synaptic cleft?

Accepted Answer

Reuptake by astrocytes or presynaptic terminal

Question 19

Which of the following best explains why muscle tissue generates heat during shivering?

Accepted Answer

Muscle contraction transforms chemical energy into mechanical energy, releasing heat as a byproduct.

Question 20

A neuron receives rapid-fire impulses from a single presynaptic neuron, resulting in multiple EPSPs that add together. What type of summation is this?

Accepted Answer

Temporal summation

Basic Cellular Physiology: Neuron and Muscle Physiology

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