83 Top Renal Physiology Objective Type Questions And Answers

1)The GFR is increased by:
A. Vasoconstriction in the afferet arteriole.
B. An increase in capsular hydrostatic pressure.
C. An increase in the surface area of glomerular capillaries
D. Adecrease in the capillary filteration coefficient.
E. An increase in the plasma colloid osmotic pressure.
Ans: C

(2) In the collecting ducts:
A. 65% of the water in the glomerular filterate is reabsorbed.
B. Urea is completely reabsorbed.
C. 80% of sodium cloride in the glomerular filterate is reabsorbed.
D. Urine osmolarity reaches 4 times as much as plasma
E. ADH decreases permeability to water.
Ans: D

(3) In the proximal convoluted tubule:
A. 30% of water from the glomular filterate is reabsorbed.
B. Glomular filtrate is hypertonic with plasma .
C. Sodium is actively secreted .
D. Glomular filtrate is isotonic with plasma .
E. Potassium ions are passively secreted .
Ans: D

(4) Renin-angiotensin system is stimulated by :
A. Increased renal blood flow.
B. Low serum K+ levels.
C. Increased arterial blood pressure.
D. Low serum sodium levels.
E. Increased glomerular filteration rate.
Ans: D

(5) Any substance filtered by the glomeruli, reabsorbed but not secreted will have renal clearance :
A. Equal to GFR.
B. Less than the clearance of glucose.
C. Equal to clearance of amino acids.
D. Less than the clearance of inulin.
E. Equal to clearance of PAH.
Ans: D

(6) Micturition:
A. A feeling of urgency arises when bladder contains 80 ml of urine.
B. Is influenced by ihibitory & facilitory centres in brain stem & cerebral cortex.
C. Is initiated if intravesicular pressure reaches 1.0 cm of water.
D. Involves contraction of external sphincter of bladder.
E. Is stimulated by motor sympathetic impulses.
Ans: B

(7) An enzyme that causes renal formation of ammonia is:
A. Adenylate cyclase.
B. Glutaminase.
C. Renin.
D. Carbonic anhydrase.
E. An ATPase.
Ans: B

(8) Renal tubules normally reabsorb the following Except:
A. 90% of glucose.
B. All filtered bicarbonates in respiratory acidosis.
C. All filtered amino acids.
D. More potassium than chloride.
E. Part of the filtered urea.
Ans: A

(9) Glucose:
A. Is only absorbed in proximal convoluted tubule.
B. Is completely reabsorbed in the distal tubule.
C. Has a plasma clearance equal to GFR.
D. Is filtered by the glomeruli & passively reabsorbed.
E. Has a Tm equal to 180-200 mg/min.
Ans: A

(10) Normal aldosterone secretion tends to raise the volume of:
A. Urine.
B. Interstitial fluid.
C. Cerebrospinal fluid.
D. Intracellular fluid.
E. Transcellular fluid.
Ans: B


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