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HPNU 3060 Questions 2 Exam And Accurate Answers
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HPNU 3060 Questions 2 Exam AndAccurate Answers
An area of the retina that contains only cones and is the site of sharpest vision is the
fovea.
outer segment.
inner segment.
optic disc.
tapetum lucidum - Answer fovea.
The ciliary muscle helps to
-control the amount of light reaching the retina.
-control the shape of the lens.
-control the production of aqueous humor.
-move the eyeball.
-none of the above - Answer control the shape of the lens.
Which of the following statements are true regarding the generation of a single action
potential?
-An action potential does not diminish in strength as it travels along the cell membrane.
-As long as a stimulus is above threshold, the strength of the stimulus does not affect the
shape of the action potential.
-Each action potential has the same characteristic waveform.
-Only A and C are true.
-A, B and C are true - Answer -A, B and C are true
Which of these functions is NOT housed within the medulla oblongata?
-centers controlling eye movement
-centers controlling blood pressure
-centers controlling vomiting
, -centers controlling breathing
-All of the above ARE housed in the medulla oblongata - Answer -centers controlling eye
movement
In order to bombard the postsynaptic cell with more molecules of neurotransmitter, the
presynaptic cell would have to
-send action potentials with longer durations.
-send action potentials with higher voltage (higher amplitude).
-send action potentials with higher frequency.
-do nothing; no change is possible since the all-or-none law is in effect. - Answer -send
action potentials with higher frequency.
Sensations of prickling pain
-are carried by type A fibers.
-reach the CNS quickly.
-can trigger somatic reflexes.
-result in conscious attention.
-all of the above - Answer -all of the above
Which of the following is not a function of glial cells?
-support
-providing directions for growth and repair
-movement
-phagocytosis - Answer -movement
Sensations of gravity and linear acceleration are registered in the
-saccule and utricle.
-semicircular canals
-cochlea
-ossicles.
-organ of Corti - Answer -saccule and utricle.
The receptors in the inner ear are the
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