Capillaries - circulation, Biology

Assignment Help:

Capillaries - Circulation

We know that most tissues have such an extensive network of capillaries that any single cell is hardly 2-3 cells away from any capillary. The small terminal arteries subdivide to form arterioles which divide to form metarterioles and then capillaries, which rejoin to form the venules and veins.

The smooth muscles of the arterioles become discontinuous in the metarterioles and end in a muscle ring the precapillary sphincter that controls the blood supply to each capillary bed. Through the precapillary sphincters, the capillary bed can be bypassed altogether and blood can be diverted to areas of greater demand. All capillaries of an animal have the potential to hold 14% of the total blood volume. However, only 30% to 50% of all capillaries are open at a time and thus only 5-7% of the total volume is contained in them.


Related Discussions:- Capillaries - circulation

Therapeutic dose of pyridoxine, Q. Therapeutic dose of pyridoxine? Ther...

Q. Therapeutic dose of pyridoxine? Therapeutic dose of pyridoxine (lg/day) is usually tried in all patients with hypermethioninernia and homocystinemia. For patients who do not

How sequences of events occur to activate protein kinase a, When glucagon b...

When glucagon binds to it's receptor on a liver cell, which one of the following sequences of events occurs to activate protein kinase A? -activation of G protein, activation of

Chemical changes during cleavage, CHEMICAL CHANGES DURING CLEAVAGE - 1....

CHEMICAL CHANGES DURING CLEAVAGE - 1.       Synthesis of DNA occurs. 2.       Synthesis of RNA (rRNA is absent, mRNA & tRNA are synthesized very little amount). 3.

Fats requirements for ulcerative colitis, Q. Fats requirements for ulcerati...

Q. Fats requirements for ulcerative colitis? Usual foods, which contain fats (invisible or inherent fat), are permitted but not fried foods, as they are not easily digested due

Polyphyletic theory, Please I need short notes on polyphylrtic theory

Please I need short notes on polyphylrtic theory

To study the structure of a seed, To study the structure of a seed Soak...

To study the structure of a seed Soak seeds of bean, pea, pumpkin, sunflower, corn and other large forms. Take away the seed- coats and carefully cut the seeds open. Discover t

How can nutrients are classified, Q. According to their functions how can n...

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

What units are the nucleic acids constituted, Q. Of what units are the nucl...

Q. Of what units are the nucleic acids constituted? What are chemical entities that compose that unit? The Nucleic acids are formed by sequences of nucleotides. Nucleotides

Digestive system - stomach, STOMACH It is wide, J-shaped, placed obl...

STOMACH It is wide, J-shaped, placed obliquely on left side in upper abdominal cavity so left kidney is slightly down ward. It is 30 cm, long and 15 cm. wide. It has g

The principal nitrogenous excretory in humans, The principal nitrogenous ex...

The principal nitrogenous excretory compound in humans is synthesised: 1. in kidneys but eliminated mostly through liver 2. in kidneys as well as eliminated by kidneys 3.

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd