Distal convoluted tubule, Biology

Distal Convoluted Tubule

A hypoosmotic fluid from the ascending loop of Henle enters the distal convoluted tubule. Under conditions of water diuresis, i.e., when there is no need for water conservation, the hypoosmotic tubular fluid passes into the collecting tubule unchanged in its osmolarity. When water is to be conserved by the body; the hypothalamo- hypophyseal system secretes antidiueretic hormone (ADH) (also known as vasopressin) which makes the walls of the distal convoluted tubule permeable to water.

So, when the ADH titer is high in the blood, water diffuses out of the distal tubule and the fluid becomes isosmotic to blood by the time it enters the collecting tubule. In amphibians and reptiles, where-there is no loop of Henle, the fluid from the proximal tubule passes into the distal tubule directly and the final concentration of the ureteral urine may be hypoosmotic or at best isosmotic. Urine in these animals is made hypoosmotic by reabsorption of salt. Under dry conditions, in these animals, the urine is made less hypoosmotic and smaller in volume due to reabsorption of water in the distal tubule under the influence of ADH. ADH is referred to as vasotocin (not vasopressin) in lower vertebrates.

Posted Date: 1/16/2013 1:58:40 AM | Location : United States

Related Discussions:- Distal convoluted tubule, Assignment Help, Ask Question on Distal convoluted tubule, Get Answer, Expert's Help, Distal convoluted tubule Discussions

Write discussion on Distal convoluted tubule
Your posts are moderated
Related Questions
Emtricitabine (FTC, Emtriva) Emtricitabine is the 5-fluorinated derivative of lamivudine. It has same safetyand efficacy, and can be given once daily. It is available alone or

According to their functions how can nutrients are classified? One possible and utile functional classification for nutrients is the one that divides them into energetic, struc

Diabetes Mellitus Management after Open Heart Surgery :  Diabetic patients undergoing coronary artery bypass surgery who are on oral hypoglycemic drugs are pre operatively s

How Vaginal infections cause Sulfonamide creams, other ''broad-spectrum'' vaginal preparations, and currently available preparations of Lactobacillus  species or dairy products

Formation of Gemmules Throughout the formation of gemmules, masses of food - laden amoebocytes called archaeocytes feed on other cells and lay down in within them. They get s

What is the meaning of Prohaptor? The specialized attachment sucker which surrounds the mouth in monogenean flukes. It comrpise adhesive structures which help attach the animal

What is Ecology? Ecology is the field of Biology that studies the relationship among living beings and among living beings and the environment.

Food Which can be Taken in Plenty and Food to be Avoided Lastly, in the context of changing the diet, we should know the foods to be avoided and the food to be taken in plenty

Why in inflammatory and infectious conditions may clinical signs related to the lymphatic system occur? The lymph nodes, or lymph glands, have lymphoid tissue that makes lympho