Biology, 26.08.2019 17:10 isiss18

The are an important part of the kidney's urine-concentrating mechanism found surrounding the nephron loops (loops of henle) of juxtamedullary nephrons.

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Answer from: makaileep1623

Vasa recta

Explanation:

Concentration of urine occurs by counter current mechanism. It is a mechanism to retain water in the body and it occurs by vasa recta and loop of Henle. Vasa rectae are the peritubular capillaries found near the loop of Henle (LOH). The blood flow in opposite directions in the two limbs of vasa rectae and also in the two limbs of LOH. The flow of fluid in the descending limb of LOH is in opposite direction to the flow of blood in ascending limb of vasa retae and vice versa. These counter current systems significantly contribute to the concentration of urine in the kidneys.

It is the cyclic movement of Na+, Cl- from the ascending limb of loop of Henle to the descending limb of vasa rectae via the medullary interstitial fluid. This is responsible for 5 % absorption of water in the descending limb of LOH, making the filtrate hypertonic. Due to this the concentration of Na+ and Cl- is more in the renal medulla. The osmolarity increases from 300 to 1200 mOsml/l from cortex to inner medulla, concentrating the urine.

Answer from: Quest

A) it will stay on the table

Answer from: Quest

answer: carbon 14 can only be used to determine the age of the organisms that were once living, and igneous rocks are non living.

explanation:

carbon 14 dating is used to determine the age of the sample by estimating the amount of carbon 14 present in the sample and then comparing it with a reference standard.carbon 14 is a isotope of carbon which is radioactive and unstable. carbon 14 is assimilated by all plants and animals throughout their life from carbon dioxide. however, one the organisms die they stop this assimilation and the carbon 14 content starts to decrease.by knowing how much of carbon 14 is left in an organism after his death, one can estimate the age of the organism. the materials whose age can be estimated by carbon 14 method are the organic compounds. however, some inorganic compounds such as aragonite shell can also be dated.however, if we consider the igneous rocks it is a non living component which never accumulated carbon 14 in it and thus, we cannot use carbon 14 dating method to estimate its age.

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The are an important part of the kidney's urine-concentrating mechanism found surrounding the nephr...