When a rod located in the retina is stimulated by light,
A) the cell depolarizes.
B) the inactive form of retinal associates with bleached opsin.
C) the release of neurotransmitter increases.
D) the activity of transducin decreases.
E) the intracellular concentration of cGMP decreases.
C) the release of neurotransmitter increases.
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The testes leave the abdominal cavity and reach the scrotum by passing through the
A. urogenital opening. B. inguinal canal. C. cloaca. D. urethra. E. Wolffian ducts.
The stimulus that directly triggers release of ANP is
A. decreased pressure detected by baroreceptors in the aorta and carotid arteries. B. increased stretch of the heart atria. C. increased saltiness in the cerebrospinal fluid bathing the hypothalamus of the brain. D. increased saltiness of tubular fluid in the proximal convoluted tubule.
Information detected by receptors is used for all of the following except::
a. to control efferent responses b. processing sensory input for arousal c. brainstem processing for perception d. affect our emotions e. none of the above
Which of the following systems is responsible for gas exchange?
A) urinary B) respiratory C) digestive D) All of the answers are correct. E) None of the answers is correct.