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

Function of dopamine in consciousness, Q. Function of Dopamine in conscious...

Q. Function of Dopamine in consciousness? An increase in dopamine activity produces an increase in wakefulness. Dopaminergic neurons in the ventral tegmental areas are constant

Bacteria, explain anatomy of bacteria

explain anatomy of bacteria

Which are the phases of the menstrual cycle, Q. Which are the phases of the...

Q. Which are the phases of the menstrual cycle? The menstrual cycle is divided into two major phases: the luteal (or secretory) phase and the follicular (or menstrual) phase.

Digestive system, describe secretory function of salivary gland

describe secretory function of salivary gland

Explain food applications of curdlan, Food Applications of Curdlan Curd...

Food Applications of Curdlan Curdlan has a variety of food applications as enumerated herewith: a)  Meat and Poultry Curdlan makes meat and poultry products juicier and

What are the factors that for influencing photosynthesis, What are the fact...

What are the factors that for influencing photosynthesis also interfere with the gross primary productivity? Mostly water and light, but also mineral salts, temperature and car

Identical chromatids bound, Q. What is the structure that to maintains iden...

Q. What is the structure that to maintains identical chromatids bound? The structure that to maintains identical chromatids bound is the centromere.

State the term in broad - lunule, State the term in broad - Lunule. In ...

State the term in broad - Lunule. In sand dollars, notches or holes which pass through the body of the animal. Their function is not fully understood though may be involved in

Pbpk modeling during human drug development, Early human studies are normal...

Early human studies are normally conducted in healthy subjects to assess acute safety and, if applicable, to monitor biochemical and pharmacological responses. These studies also p

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