6. Determine how the osmolarity of the fluid in each structure compares to blood

Question

6. Determine how the osmolarity of the fluid in each structure compares to blood plasma. Is the fluid in the structure isoosmotic, hyperosmotic or hypoosmotic to blood plasma? a. Bowman's Space: The fluid in Bowman's space filtrate") is to plasma. b. Why? c. (answered for you)End of PCT/beginning of descending limb of the LH: The filtrate is isosmotic to plasma. d. If certain processes happened to the filtrate in the PCT, why is it isosmotic? here is to plasma. e. Bottom of the LH: The filtrate f. Why? g. Beginning of the DCT: The filtrate here is to plasma. h. Why? i. Cortical Collecting Duct: The filtrate here is j. This filtrate can just be excreted as urine, or something can to plasma happen to it in the medullary collecting duct. What can happen to it in the medullary collecting duct?

Explanation / Answer

Part a and b) hypoosmotic, because Bowman’s space filtrate does not contain the albumin protein. That causes almost 80% reduction of oncotic pressure.

Part d)

The osmolarity is equal but here Sodium is 3 times more in PCT than the plasma. That accounts for 99% reabsorption of Sodium. That is why we get the most absorption in the PCT.

Part e and f)

Here we get Hyperosmolarity in loop of Henle. That is due to presence of NaCl with very low water amount. Mostly water has absorberd in the PCT.

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