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

How many chromosomes and chromatin strands, Drosophila has 4 bivalents (hom...

Drosophila has 4 bivalents (homologous chromosomes) formed at Meiosis I. How many chromosomes and chromatin strands are present in each of the following stages- Anaphase of mito

Phylum Protozoa, Make a detailed study on Phylum Protozoa taking an example...

Make a detailed study on Phylum Protozoa taking an example with clear labeled diagrams.

Explain procedure for test the presence of sugar in honey, Procedure for Te...

Procedure for Test the Presence of Sugar in Honey? 1. Mix 5 grams of honey with 5 ml ether in a mortar and pestle. 2. Decant off the ether extract into an evaporating dish.

Residual soils-types of soil, Residual Soils Residual soils are formed ...

Residual Soils Residual soils are formed at the same site where the weathering of the parent rock has taken place or soils formed in situ from the underlying rocks. These are a

Name the nitrogenous waste excreted in the larval, What benefit does the se...

What benefit does the sea anemone get in the sea anemone-hermit crab facultative mutualism? Give an alternative term for this part of mutualism. Name the nitrogenous wast

Which type of defense cell do viral infections, Q. Of which type of defense...

Q. Of which type of defense cell do viral infections stimulate the multiplication? The main leukocytes that generally participate and multiply in the defense against viral infe

What do protozoans eat, Q What do protozoans "eat"? Do they move in search ...

Q What do protozoans "eat"? Do they move in search for food? Protozoans are heterotroph beings that are they do not make their own food and thus they need to search for it in t

Estuaries - aquatic ecosystems, Estuaries - Aquatic Ecosystems All the...

Estuaries - Aquatic Ecosystems All the rivers and lakes ultimately drain into the sea. However, many rivers develop a highly specialised zone before joining the proper sea. Th

Describe in detail about the huntington''s disease, Describe in detail abou...

Describe in detail about the Huntington's disease The brain of a person who has died as a result of Huntington's disease or Alzheimer's disease will look abnormal even to the

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