Which of these is one reason you can distinguish between a needle prick on the foot and an ice cube on the wrist?
A. The ice cube stimulates a different class of receptors than the needle prick, even though both signals go to exactly the same location in the brain.
B. The action potentials from the needle prick are inherently different from the impulse generated by the ice cube.
C. The region of the brain to which one receptor pathway leads is different from the region to which the other pathway leads.
D. The needle prick generates a stronger action potential in any one neuron than an ice cube does.
E. The needle prick generates a higher frequency of action potentials than the ice cube does.
C
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Answer the following statements true (T) or false (F)
1) Irritation of the phrenic nerve may cause diaphragm spasms called hiccups. 2) The obturator nerve branches from the sacral plexus. 3) Reciprocal inhibition means that while one sensory nerve is stimulated, another sensory neuron for synergistic muscles in the same area is inhibited and cannot respond. 4) The mucous membrane that lines the eyelids and is reflected over the anterior surface of the eyeball is the conjunctiva. 5) Researchers have found that retinal ganglionic fields are of two types: on center or off center.
The limbic system
a. is a ring of forebrain structures surrounding the brain stem b. plays a key role in emotion c. contains regions designated as reward and punishment centers d. is characterized by all of the above e. is not characterized by any of the above
Which of the following represents an endocrine secretion?
Postganglionic sympathetic axons are carried from the sympathetic trunk to the spinal nerve by the
A. splanchnic nerves. B. superior cervical ganglion. C. white rami communicantes. D. gray rami communicantes. E. pterygopalatine ganglion.