Types of blood vessel, Biology

Assignment Help:

Types of Blood Vessel

Arteries

Arteries carry blood away form the heart via the pulmonary artery and aorta.

Arterioles

As major arteries begin to branch , they become smaller and capable of distkntion of constriction because of their muscle layer. These arterioles control the amount- of blood flow that will be delivered to the capillary bed.
The precapilliary sphincters that lie immediately proximal to the capillary bed control the capillary filling and shunting. They can increase central blood volume by constriction or increase the peripheral blood supply by dilatation.

Capillaries

These are very small vessels providing almost 60,000 miles of vascular tubules and composed almost exclusively of endothelial cells, thereby facilitating the passage of nutrients, plasma, oxygen and waste products across their membrane.
They are extensive in organs with high metabolic demands.

Veins

Blood form capillaries travels through small veins called venules ( which become larger as they approach the heart, derminating in the two largest veins-the superior and the inferior vena cavae. Veins have a thicker adventitia but
a much thinner middle muscle layer. Veins contain valves that promote blood flow to the heart against the forces of body and gravity.


Related Discussions:- Types of blood vessel

Describe nerve cells, In eukaryotes possibly the most rapid and complex sig...

In eukaryotes possibly the most rapid and complex signaling is mediated through nerve impulses.  The Nerve  cells  (neurons)  consist  of  a cell  body  with  numerous projections

Describe animal which limits activity to period of dim light, Which term is...

Which term is used to describe an animal which limits its activity to periods of dim light at dawn and dusk? a) Diurnal (pron: die-ER-nal) b) Vesperal (pron: VESS-per-al)

Which heavy metals cause toxic pollution, Besides mercury which other heavy...

Besides mercury which other heavy metals cause toxic pollution? Examples of other heavy metals that cause toxic pollution are lead, cadmium and chromium.

Explain the both sex-linked trait and a sex-influenced trait, Explain the d...

Explain the difference among a sex-linked trait and a sex-influenced trait. A sex-influenced trait is influenced by the presence of sex hormones and its genes are not situated

What is splitin first heart sound, What is Splitin first heart sound ? ...

What is Splitin first heart sound ? In complete RBBB, due to delay of tricuspid closure, the split is wide. In complete LBBB, due to delay of mitral closure the S I is single.

Explain the preliminary treatment of implant therapy, Preliminary treatment...

Preliminary treatment of implant therapy It is important to ensure a healthy oral environment before going ahead with implant procedure. The treatment needs to be initiated in

Laws of cleavage, L A W S OF CLEAVAGE - 1. Sac's Law - According t...

L A W S OF CLEAVAGE - 1. Sac's Law - According this law, during cleavage each blastomere to form similar blastomere. New cleavae always take place at the right angle of th

Determine causes of iron deficiency anaemia, Determine Causes of Iron Defic...

Determine Causes of Iron Deficiency Anaemia? Dietary Inadequacy Poor bioavailability of iron Presence of absorption interfering substances in diet Poverty and

Zoology, Protozoa general characters and classification

Protozoa general characters and classification

Difference between an ecological niche and a habitat, What is the differenc...

What is the difference between an ecological niche and a habitat? An ecological niche is a set of peculiar activities, resources and methods that a species explores to survive

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