1. Please describe each of the numbered steps in the figure below, which shows both the tubular and vascular elements of the nephron. Which functions are performed at each different segment along the length of the nephron? Vascular Elements 10 9 8 7 6 Tubular Elements 1 2 3 4 5 11 Filtered 180 L/day 100% volume 300 mOsM Start of Loop of Henle 54 L/day 30% volume 300 mOsM 12 13 12 13 12 12 End of Loop of Henle 18 L/day % volume 100 mOsM End of Collecting duct 1.5 L/day % volume 50-1200 mOsM 12 13 14 To renal vein
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Start of Collecting Duct: This is the beginning of the collecting duct, which receives urine from multiple nephrons. At this point, the urine is still very dilute and has a low osmolarity. Show more…
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1. What is the 2nd step of nephron filtration? A. Tubular secretion B. Tubular absorption C. Tubular resecretion D. Tubular reabsorption 2. About how many nephrons are in each kidney? A. 1 billion B. 1 million C. 10 million D. 10 thousand 3. The urinary system specializes in removing _____ waste. A. chemical B. food C. blood D. waste
Sri K.
Match the following structures of the nephron with the correct functions: Impermeable to water; reabsorption of Na+, K+, Cl- from filtrate into medullary interstitium and blood reabsorption of most components of filtrate- glucose, ions, water reabsorption of water ADH dependent; reabsorption of Na+ and urea to maintain osmotic gradient of medulla permeable to water only; reabsorption of water through aquaporin channels filtration of small solutes, glucose, and water to create filtrate ADH dependent reabsorption of water; Aldosterone dependent reabsorption of Na+/secretion of K+ secretion of excesses, wastes, and drugs; PTH dependent reabsorption of Ca++
Explain the structure of the nephron, being sure to describe the function of each segment. Describe how the nephron filters the blood to remove nitrogenous wastes. (Which path do blood cells follow? Which path do useful substances follow? Which path do nitrogenous wastes follow?) Finally, describe how the majority of water is reabsorbed by the nephron and how water conservation occurs and is controlled.
Madhur L.
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