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Ascending

Ascending

Rising or curving upward.

(Science: botany) growing erect after an oblique or semi-horizontal beginning.


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sizes of parts of a cell

Is the following list of items in the ascending order of their relative sizes? nucleotide<base pair<codon<promoter<hemoglobin mRNA<hemoglobin gene<ribosome<chromosome. tyvm

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by fantic
Tue Nov 15, 2011 9:22 am
 
Forum: Cell Biology
Topic: sizes of parts of a cell
Replies: 8
Views: 3964

Kidneys and permeability to urea

... the blood and into the nephron, and then a significant proportion is reabsorbed in the PCT which is also permeable. The thin sections of both the ascending and descending regions of the loop of henle are also permeable, but since there is a high concentration of solutes in the renal medulla there ...

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by Babybel56
Wed May 11, 2011 6:12 pm
 
Forum: Human Biology
Topic: Kidneys and permeability to urea
Replies: 1
Views: 3533

Loop of Henle and Vasa Recta

... rise to meet the very hypertonic osmolarity of the interstitial fluids in the renal medulla (so it gets concentrated and stays that way). In the ascending loop the membrane is impermeable so water cannot get in, but there is an active reabsorption of ions like Na+, K+ and Cl- meaning that the ...

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by Babybel56
Wed May 11, 2011 6:07 pm
 
Forum: Human Biology
Topic: Loop of Henle and Vasa Recta
Replies: 3
Views: 13292

Loop of Henle - Kidneys

... of the medulla...but what is the purpose of that then? What is the purpose of Loop of Henle Where is Loop of henle permeable to urea, is it in the ascending limb? and then collecting duct is permeable to urea as well?

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by snezka18
Wed May 11, 2011 4:23 pm
 
Forum: Human Biology
Topic: Loop of Henle - Kidneys
Replies: 1
Views: 3056

Loop of Henle and Vasa Recta

... has it done here). This creates a high Na+ concentration where it's needed in the medulla of the kidney for the collecting ducts later. On the ascending loop very little water is allowed back in because the walls are impermeable, so the high concentration of solutes in the Loop is maintained ...

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by Babybel56
Sat May 07, 2011 3:06 pm
 
Forum: Human Biology
Topic: Loop of Henle and Vasa Recta
Replies: 3
Views: 13292
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