Which one of the following describes saltatory conduction:

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Question 1 of 5

Which one of the following describes saltatory conduction:

A. occurs only if the myelin sheath is continuous B. occurs only if the nodes of Ranvier are lacking C. occurs only in the absence of axon hillocks D. is faster than conduction on an unmyelinated fiber

Correct Answer: D

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.

Question 2 of 5

The highest amount of refraction in the human eye, under normal conditions, occurs at:

A. The lens B. The cornea C. The retina D. The sclera

Correct Answer: B

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.

Question 3 of 5

The fovea allows for increase visual acuity by which of the following specializations:

A. high ratio of photoreceptors to ganglion cells B. lateral displacement of the ganglion cells from the retina C. all of the photoreceptors here are rods, which are more resistant to photobleaching D. the abundance of blood vessels to nourish this metabolically active area

Correct Answer: B

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.

Question 4 of 5

What is the principle function of the tympanic membrane and the ossicular chain of the middle ear?

A. to couple acoustic energy from the air to the endolymph in the cochlear duct B. to protect inner ear from damage C. to decrease the sensitivity to all sounds D. capacitance matching

Correct Answer: A

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.

Question 5 of 5

Agnosias are the inability to recognize objects even when the ability to recognize their components (simple sensory skills) are intact. Damage to which component of the nervous system is likely to cause an agnosia?

A. Peripheral sensory neurons B. Ventral posterior nucleus of the thalamus C. primary somatosensory cortex D. posterior parietal cortex

Correct Answer: D

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.

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