Exam 4: The Peripheral Nervous System

The brain contains naturally occurring morphine-like substances.

In the visual pathway,which statement is true? ___________________________.

Indicate the properties of rods and cones by using the answer code (options may be used more than once or not at all). -used for day vision

Indicate the characteristics associated with each part of the ear by using the answer code (options may be used more than once or not at all). -contains receptive hair cells

Light must pass through several layers of retinal cells before reaching rods and cones.

Activation of a sensory pathway at any point gives rise to the same sensation that would be produced by stimulation of the receptors in the body part itself.

Indicate the properties of rods and cones by using the answer code (options may be used more than once or not at all). -little convergence in pathways

Which statement concerning phasic receptors is correct?

What must happen for accommodation to occur?

Normal breathing patterns directly bring odoriferous molecules in contact with the olfactory mucosa.

The stronger the stimulus,the greater the frequency of action potentials generated and propagated in the afferent neuron.

Which of the following are NOT correctly paired?

Sour taste is caused by the hydrogen ions from acids.

What is astigmatism?

Which statement concerning pacinian corpuscles is correct?

Indicate which of the following regions are part of ascending pain pathways, descending analgesic pathways, or both by using the answer code. -thalamus

In which structure do sound waves first pass?

Each region of the auditory cortex becomes excited only in response to a specific tone detected by a selected portion of the basilar membrane.

Rapid reduction in sensitivity to a new odour results from rapid adaptation of the olfactory receptors.

Descending analgesic pathways are believed to suppress transmission in the pain pathways as they enter the spinal cord by blocking the release of substance P.