Q. No.A countercurrent mechanism system is a mechanism that expends energy to create a concentration gradient. This mechanism in human kidneys involves:
1. proximal tubule and distal tubule.
2. loop of Henle and vasa recta.
3. distal tubule and collecting duct.
4. glomerulus and Bowman's capsule.
1. proximal tubule and distal tubule.
2. loop of Henle and vasa recta.
3. distal tubule and collecting duct.
4. glomerulus and Bowman's capsule.
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During concentration of urine, urea diffuses out of and enters respectively into the:
| 1. | proximal tubule, descending limb of the vasa recta |
| 2. | descending limb of vasa recta, ascending limb of the loop of Henle |
| 3. | ascending limb of the loop of Henle, collecting duct |
| 4. | collecting duct, ascending limb of the loop of Henle |
Identify the incorrect statement regarding the micturition reflex:
1. It can be inhibited by higher centers in the brain.
2. It is stimulated by accumulation of urine stretching bladder wall.
3. can be stimulated by irritation of the bladder or urethra.
4. it is coordinated in lumbar spinal cord.
The urinary system in humans is not involved in:
1. gluconeogenesis
2. activation of vitamin D
3. regulation of leukocyte and platelet production
4. regulation of blood volume and, indirectly, blood pressure
The endocrine gland located at the superior pole of kidney is:
1. spleen
2. pancreas
3. adrenal gland
4. testes
10 to 15 distinct conical or triangular structures in the human kidney are seen in renal ______ and are known as renal ____________.
| 1. | pelvis; calyces | 2. | medulla; pyramids |
| 3. | cortex; columns of Bertini | 4. | cortex; lobes |
All of the following regarding juxtamedullary nephrons in human kidneys are correct except:
| 1. | the entire nephron is located in the superficial cortex of the kidney |
| 2. | the renal corpuscle comprises a glomerulus and a glomerular capsule |
| 3. | blood arrives at the glomerular capillaries via an afferent arteriole |
| 4. | the proximal convoluted tubule leads into a long nephron loop |
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The part of the nephron where both hydrogen and potassium ions are secreted into the tubular fluid is the
| 1. Malpighian body | 2. proximal convoluted tubule |
| 3. loop of Henle | 4. distal convoluted tubule |
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The flow rate of filtered fluid through the kidney is:
1. glomerular filtration rate.
2. renal plasma flow.
3. filtration fraction.
4. renal blood flow.
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Given that the hydrostatic pressure at the glomerulus is 50 mm Hg, the blood colloid osmotic pressure is 30 mm Hg and the capsule pressure is 20 mm Hg, the net filtration pressure would be:
1. (--) 20 mm Hg.
2. 0 mm Hg.
3. 20 mm Hg.
4. 60 mm Hg.
5. 80 mm Hg.
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