The entry of ingested food into the duodenum can suppress further eating via
a. the inhibition of gastric emptying.
b. the suppression of ghrelin secretion from the stomach.
c. activation of sympathetic nerve fibers that innervate the liver.
d. the secretion of insulin from the duodenum.
e. suppression of CCK release from the stomach.
Answer: b. the suppression of ghrelin secretion from the stomach.
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a. ego c. subego b. id d. superego
Which of the following statements is true regarding sustained attention?
A) A greater slowing of heart rate while focused on complex stimuli is a physiological indicator of sustained attention. B) Children are not capable of intentional, goal-directed sustained attention until they enter elementary school. C) Improved language development is responsible for gains in sustained attention. D) Environmental factors have minimal impact on the development of sustained attention.