The function of the respiratory system is to ________
A) supply the body with oxygen and carbon dioxide
B) convert carbon dioxide to oxygen and carbon
C) supply the body with oxygen and eliminate carbon dioxide
D) create oxygen and break down carbon dioxide
Answer: C
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When a photoreceptor cell is stimulated by light:
A) the photoreceptor hyperpolarizes as sodium ion channels close. B) sodium ions enter the outer segment of the photoreceptor and depolarize it. C) opsin and cis-retinal combine to form rhodopsin. D) transducin and phosphodiesterase (PDE) are inactive.
Air traveling from the tertiary bronchi must pass through the ________ to reach the pulmonary lobule
A) secondary bronchi B) alveoli C) primary bronchi D) terminal bronchioles E) trachea
Neurohypophyseal secretion of ________ stimulates formation of concentrated urine.
A. angiotensin I B. renin C. antidiuretic hormone D. aldosterone
In cystic fibrosis, if the affected cells swell with liquid from the interstitial fluid, what would happen to the mucus on the surface of those cells?
A) It would be too runny or syrupy and be swept away rapidly. B) It would not be secreted by the cell. C) It would be thick, sticky, and difficult to move. D) It would no longer contain lysosymes and other antimicrobial chemicals.