Question 1

During an action potential, which of the following best describes the sequence of ion permeability changes across the neuronal membrane?

Accepted Answer

Sodium permeability increases rapidly, then decreases as potassium permeability increases.

Question 2

Which of the following statements about saltatory conduction is correct?

Accepted Answer

Saltatory conduction involves the action potential jumping from one node of Ranvier to the next, increasing conduction speed.

Question 3

A patient is given a drug that blocks voltage-gated sodium channels. What effect will this have on the generation of action potentials?

Accepted Answer

Action potentials will not be generated because sodium influx is necessary for depolarization.

Question 4

Which of the following best describes the absolute refractory period of a neuron?

Accepted Answer

It is the period when no stimulus, regardless of strength, can initiate another action potential.

Question 5

Which of the following events triggers the release of neurotransmitter at a chemical synapse?

Accepted Answer

Opening of voltage-gated calcium channels and influx of calcium ions.

Question 6

If a postsynaptic potential causes hyperpolarization of the postsynaptic membrane, what type of potential is it?

Accepted Answer

Inhibitory postsynaptic potential (IPSP)

Question 7

Which of the following best describes the function of the blood-brain barrier?

Accepted Answer

It selectively restricts the passage of certain substances from the blood into the brain, protecting neural tissue.

Question 8

Which of the following structures is responsible for producing cerebrospinal fluid (CSF)?

Accepted Answer

Choroid plexus

Question 9

A patient has damage to the dorsal root of the spinal cord. Which function is most likely to be impaired?

Accepted Answer

Sensory input from the periphery

Question 10

Which of the following is a function of the hypothalamus?

Accepted Answer

Regulating homeostasis, including body temperature and hunger

Question 11

Which of the following anterior pituitary hormones is considered tropic?

Accepted Answer

Thyroid-stimulating hormone (TSH)

Question 12

Which area of the cerebral cortex is primarily responsible for processing somatic sensory information?

Accepted Answer

Primary somatosensory cortex

Question 13

Which of the following best defines the term 'transduce' in the context of sensory physiology?

Accepted Answer

To convert a physical stimulus into a change in membrane potential

Question 14

A receptor potential is generated when:

Accepted Answer

A sensory receptor is activated by an adequate stimulus, causing a graded change in membrane potential.

Question 15

Which of the following is an example of a nonneural receptor?

Accepted Answer

Hair cell in the cochlea

Question 16

Which of the following best describes the adequate stimulus for a photoreceptor?

Accepted Answer

Light (photons)

Question 17

A patient is unable to distinguish between two closely spaced points on their skin. This deficit is most likely due to:

Accepted Answer

A large receptive field and low receptor density in that area.

Question 18

Which of the following best explains the gate control theory of pain?

Accepted Answer

Activation of non-painful sensory input (such as A\beta fibers) can inhibit the transmission of pain signals from C fibers.

Question 19

Which of the following is true regarding the difference between fast and slow pain fibers?

Accepted Answer

Fast pain is carried by myelinated A\delta fibers, while slow pain is carried by unmyelinated C fibers.

Question 20

A person touches a hot stove and quickly withdraws their hand. Which neural pathway is primarily responsible for transmitting this pain sensation to the brain?

Accepted Answer

Spinothalamic (anterolateral) pathway

Human Physiology: Study Notes for Chapters 8 (Part 2), 9, and 10

Guida di studio - Domande di pratica

Study guide - Flashcard