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
Explain the neuritic type of infantile beriberi? It is also referred to as Wernicke korsakoff syndrome or cerebral beriberi. It shows typical manifestations of peripheral neuro

Define Hormonal imbalance as a factor for obesity? Certain diseases associated with secretion of hormones, e.g., hypothyroidism, hypogonadism and Cushing's syndrome exhibit obe

Galvanotaxis - Modes of Cell Movement Galvanotaxis considers to the movement of cells in response to a potential variation between cells. It is suggested that there are voltag

Multiple Fission - Types of Asexual Reproduction Multiple fission is a variation of fission where the parent divides mitotically into a number of smaller units that are the da

P A TTERNS OF CLEAVAGE - Patterns of cleavage depends upon amount of yolk & distribution of yolk. These are following types - 1 .       RADIAL CLEAVAGE PATTERN -

Water Soluble Vitamins B-vitamins are abundant in milk and other feeds. B-vitamins are synthesized by rumen microorganisms, beginning soon after a young animal begins feeding.

Draw a section of the microscopic structure of human retina and label any six parts in it. a)  Name the structure that determines the eye colour in humans. What is the normal f

Describe the relationship of different systems in diabetes mellitus Diabetes Mellitus has direct relationship with endocrine system, especially with endocrine part of the panc

Ordinary share capital This type of Equity finance is raised from the public from the sale of ordinary shares to the shareholders. This finance is presented to limited compan

Define Muscular endurance component for physical fitness? It is the ability of a muscle, or a group of muscles to sustain repeated contractions or to continue applying force ag