E) so. The ptt of the intracelluler fluid is buffered mainly by c) phosphates. D
ID: 3483482 • Letter: E
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E) so. The ptt of the intracelluler fluid is buffered mainly by c) phosphates. D) carbonic acid. E) ammonium ions 51. By constriction of thethe blood pressure in the glomerulus is maintained evern when systemic blood pressure drops. A) afferent arteriole C) proximal convoluted tubule D) distal convoluted tubule E) renal artery 52. When the hypothalacsmceptors detect a rise in blood osmolarity A) the kidneys secrete renin. B) the kidneys secrete aldosterone. the posterior pituitary releases ADH. the heart secretes ANP. D) E) 53. In diabetes mellitus, glycosuria occurs because the concentration of glucose in the glomerular filtrate exceeds A) the reabsorption capacity of the collecting duct. the transport maximum of the proximal tubule. B) C) its concentration in the blood plasma. D) E) the rate of renal clearance of glucose. the glomerular filtration rate. 54. The limiting pH is a value below which A) human life cannot be maintained. B) hydrogen ions cannot be secreted into the tubular fluid. C) hydrogen ions cannot be reabsorbed from the tubular fluid. D) the bicarbonate buffer system no longer works. E) hydrogen ions must be buffered by ammonia. Page 9Explanation / Answer
49. A.
Intrinsic factor is required for absorption of Vitamin B12. It is produced in the stomach.
50. B proteins
pH of intracellular fluid is around 6.8 due to acid production. It contains low HCO3- levels and so pCO2 above 45mmHg.
51. A
Afferent arterioles have larger diameter than efferent arterioles. These are high resistance vessels. Hence blood pressure is high . Therefore, maintains normal pressure despite low pressure in systemic vessels.
52. D
Osmolality of blood increases with dehydration and decreases with over hydration.
Increased osmolality in blood- posterior pituitary secretes ADH - increased water absorption - more concentrated urine- less concentrated plasma- normal blood osmolality regained.
53. D
54. B
Hydrogen ions cannot be secreted into the tubular fluid.
57. C
58. C
800 ml to 2000 ml
59 B
False
60. A
61. Systole
62. Hypokalemia
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