Which of the following statements regarding pain pathways is FALSE?
A. Substance P is an important neurotransmitter in specific pain pathways.
B. Transmission of information in pain pathways may be inhibited by activation of neurons that synthesize opiate neurotransmitters.
C. Synaptic activity in afferent neurons associated with pain receptors can be inhibited by axon-axon synapses with neurons from descending pathways.
D. Afferents neurons that detect painful stimuli in the skin can converge onto common ascending pathways with neurons that detect painful stimuli in internal organs.
E. Substance P is released by neurons descending from the brain, and it inhibits activation of ascending pain pathways.
E
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A) potassium B) sodium C) calcium D) magnesium E) both potassium and sodium
The control of hormone secretion by its own effects is called ________.
A. antagonist effector B. negative feedback inhibition C. positive feedback D. negative feedback
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A. contain cupulae that respond to gravity. B. are parallel to each other. C. can detect movement in only one direction. D. have a base called a papilla. E. allow a person to detect movement in all directions.
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A) apex. B) hilum. C) base. D) septum. E) mediastinum.