Which is NOT true about receptors that mediate digestive reflexes?
A. They include chemoreceptors, osmoreceptors, and mechanoreceptors.
B. They only activate feedforward pathways.
C. They may be endocrine cells.
D. They may relay information to integrative centers in the CNS or to the enteric plexuses.
E. They are located in the gastrointestinal tract wall.
Answer: B
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Why do sprint coaches stress "heel to buttocks" during sprinting?
A. reduces moment of inertia of the leg with respect to the hip B. reduces moment of inertia of the lower leg with respect to the knee C. reduces moment of inertia of the foot with respect to the ankle D. there is no scientific basis for this coaching cue
Where on the sacrum is the sacral promontory?
A. anterior B. posterior C. superior D. inferior E. lateral
Which of the following statements concerning hormones is incorrect?
a. a single endocrine gland may produce multiple hormones. b. a single target cell may be influenced by more than one hormone. c. a single hormone can influence only one type of target cell. d. an endocrine organ may exert nonendocrine functions in addition to secreting hormones. e. the same hormone may be secreted by more than one endocrine gland.
The role of acetylcholine in the digestive tract is to _________, while the role of norepinephrine is to ______
A. stimulate, stimulate B. stimulate, inhibit C. inhibit, inhibit D. inhibit, stimulate