If the blood pH decreases below normal, the kidney tubules secrete
fewer hydrogen ions from blood to urine.
more hydrogen ions from blood to urine.
more sodium ions into the urine.
Both A and C will occur.
The Correct Answer is B
A. fewer hydrogen ions from blood to urine: This would make the blood even more acidic, which is the opposite of what the body needs when pH is low.
B. more hydrogen ions from blood to urine: This is the correct response; when blood pH drops (becoming acidic), the kidneys excrete excess H+ ions into the urine to restore balance.
C. more sodium ions into the urine: Usually, the kidneys reabsorb sodium while excreting hydrogen to maintain electrochemical balance.
D. Both A and C will occur: This is incorrect because choice A describes a process that would worsen acidosis.
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Related Questions
Correct Answer is D
Explanation
A. Allows the body to avoid the use of oxygen: This describes anaerobic respiration. Aerobic respiration requires oxygen.
B. Results in the formation of an incompletely catabolized molecule: This describes fermentation or anaerobic pathways. Aerobic respiration completely breaks glucose down into CO2 and H2O.
C. Results in the formation of lactate: Lactate is a product of anaerobic metabolism (glycolysis without oxygen).
D. Produces the maximum amount of energy: By using the Krebs cycle and Electron Transport Chain, aerobic respiration yields significantly more ATP (approx. 36-38) than anaerobic processes (2 ATP).
Correct Answer is C
Explanation
A. proliferative: This phase occurs before ovulation, during which the uterine lining builds up.
B. follicular: This phase occurs before ovulation, while the egg is maturing inside the follicle.
C. luteal: This is the correct phase; it begins after ovulation (formation of the corpus luteum) and ends when menses starts.
D. estrogenic: This is not a formal phase name, though it describes the time when estrogen is the dominant hormone (pre-ovulation).
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