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All of the following cranial nerves are involved in proprioception except the:

A.

Vagus.

B.

Hypoglossal.

C.

Accessory.

D.

Abducens.

Answer and Explanation

The Correct Answer is A

A. Vagus: While the Vagus nerve (CN X) has many sensory functions, it is primarily involved in visceral sensation and parasympathetic control, rather than proprioception (sense of body position) for skeletal muscles.

B. Hypoglossal: CN XII carries proprioceptive fibers from the tongue muscles.

C. Accessory: CN XI carries proprioceptive fibers from the sternocleidomastoid and trapezius muscles.

D. Abducens: CN VI (and other nerves moving the eye) carries proprioceptive feedback regarding the position of the eyeball.


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Correct Answer is {"dropdown-group-1":"B"}

Explanation

A. Spectrin: As noted earlier, this is a protein that helps maintain the shape of red blood cells.

B. Hematocrit: A hematocrit test measures the "packed cell volume" to see what percentage of whole blood is made up of red blood cells.

C. Hematopoiesis: This is the physiological process of blood cell formation, not a measurement.

D. Hemocytometer: This is a specialized slide used to count individual cells under a microscope, but it does not measure the volume percentage directly like a centrifuge/hematocrit.

Correct Answer is {"dropdown-group-1":"B"}

Explanation

A. positive: The outside of the neuron is more positive due to a higher concentration of sodium ions (Na+).

B. negative: During the resting membrane potential, the inside of the neuron is negatively charged (typically -70mV) relative to the outside, largely due to internal proteins and the leakage of potassium.

C. equal: If the charge were equal, there would be no membrane potential, and the neuron could not fire an impulse.

D. None of the above: Incorrect, as choice B is the standard physiological fact.

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