To discuss:
The percentage of the glomerular filtrate that is eliminated as urine, and percentage of the water in the filtrate that is reabsorbed by PCT and nephron loop.
Introduction:
The principal system that is involved in the excretion of waste is the urinary system. From the blood, the
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- Water and small solutes enter nephrons during ________. a. filtration b. reabsorption c. secretion d. both a and barrow_forwardAs the text noted, two-thirds of the water and solutes that the body reclaims by reabsorption in nephrons occurs in the proximal tubule. Proximal tubule cells have large numbers of mitochondria and demand a great deal of oxygen. Explain why.arrow_forwardFatty tissue holds the kidneys in place. Extremely rapid weight loss may cause this tissue to shrink so that the kidneys slip from their normal position. On rare occasions, the slippage can put a kink in one or both ureters and block urine flow. Suggest what might then happen to the kidneys.arrow_forward
- Reabsorption depends on _________. a. osmosis across the nephron wall b. active transport of sodium across the nephron wall c. a steep solute concentration gradient d. all of the abovearrow_forwardWhich of the following does not contribute to the process of filtration? (a) active transport by epithelial cells lining renal tubules (b) large surface area for filtration (c) low permeability of glomerular capillaries (d) high hydrostatic blood pressure in glomerular capillaries (e) podocytesarrow_forwardThe afferent arteriole delivers blood to the (a) renal artery (b) efferent arteriole (c) renal vein (d) capillaries of the glomerulus (e) peritubular capillariesarrow_forward
- Figure 41.6 Which of the following statements about the nephron is false? The collecting duct empties into the distal convoluted tubule. The Bowman’s capsule surrounds the glomerulus. The loop of Henle is between the proximal and distal convoluted tubules. The loop of Henle empties into the distal convoluted tubule.arrow_forwardWhich of the following does not contribute to the high salt concentration in the interstitial fluid of the kidney medulla? (a) active transport of sodium from the upper part of the ascending limb (b) diffusion of salt from the ascending limb of the loop of Henle (c) reabsorption of salt from various regions of Bowmans capsule (d) counterflow of fluid through the two limbs of the loop of Henle (e) diffusion of urea out of the collecting ductarrow_forwardWhich factor plays the dominant role in the first stage of urine formation? Barometric pressure Osmotic pressure lonic pressure Hydrostatic pressurearrow_forward
- Aldosterone stimulates sodium reabsorption and potassium secretion inA. The proximal convoluted tubuleB. The descending limb of the nephronC. The ascending limb of the nephronD. The cortical collecting ductarrow_forwardWhich of the following is NOT a potential filtration barrier in the glomerular capsule? A Parietal layer of the glomerular capsule B Capillary fenestrae Slit dianhragmarrow_forwardTrue or false All chemicals in the glomerular capillaries are filtered into the nephron. Chemicals move from the glomerular caspule directly to the distal convoluted tubule of a nephron.arrow_forward
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