Based on what you know about the actions of filtration, reabsorption, and secret

Question

Based on what you know about the actions of filtration, reabsorption, and secretion in the nephron of the kidney, indicate whether the following statements are true or false.

1. Only about 75-80% of the plasma is filtered from the blood as it circulates through the glomerulus.
2. Proteins and blood cells are prevented from leaving the glomerular capillaries.
3. If the afferent arteriole dilates, more blood enters the glomerulus, thus less plasma will flow into Bowman’s capsule.
4. Most of a solute (65% to 100%) is reabsorbed from the collecting duct.
5. If a particular transport molecule reaches its Tm, the substance that it is transporting will be excreted in the urine.
6. Secretion does not occur in the proximal tubule.
7. The collecting duct is permeable to water but not to ions.

Explanation / Answer

1. True. A plasma level of 350mg/dL is released in urine.

2.False. Glomerular capillaries allows proteins to pass through it and prevents red blood cells.

3.True

4. True

5. True

6.False. Secretion of drugs occurs in proximal tubule.

7.False. It is permeable to ions also, as it is involved in reabsorption of ions and maintaining electrolyte balance.

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