Blood vessels - circulation, Biology

Assignment Help:

Blood Vessels - Circulation

The blood vessels have elastic walls and a layer of smooth muscles in their walls which enable them to change their diameter. There are three main types of blood vessels - arteries, capillaries and veins with characteristic differences among them. Arteries have relatively thick walls that consist of heavy, strong layers of elastic fibres and smooth muscles. As the arteries branch, their diameter becomes smaller and the relative amount of muscle tissue increases in proportion to the elastic tissue.

Capillaries are the smallest units, they are single cell thick. Almost all exchange between tissue and blood takes place through the walls of the capillaries. The veins also contain smooth muscles and fibres.


Related Discussions:- Blood vessels - circulation

What are the antigens and antibodies of abo blood system, What are the anti...

What are the antigens and antibodies of each blood type of the ABO blood system? Type A: antigen A, antibody anti-B. Type B: antigen B, antibody anti-A. Type AB: antigens A and

Molecular bio, he recombinant plasmid extracted from the surviving colonies...

he recombinant plasmid extracted from the surviving colonies contains a gene called SUC2 that codes for convertase, an enzyme needed to metabolize sucrose. Mutations in the SNF gen

Which statement is true of the energy levels, Which statement is true of th...

Which statement is true of the energy levels of electrons in shells? A) All the electrons in an atom have similar amounts of energy. B) Electrons must lose energy to move from the

A patient was complaining of frequent urination, A patient was complaining ...

A patient was complaining of frequent urination, excessive thirst and dehydration. His fasting glucose level was found to be normal. Name the disease and its cause. Describe

Explain precautions for gram staining of bacterial cultures, Explain Precau...

Explain Precautions for Gram Staining of Bacterial Cultures? 1. Heat fix the smear, otherwise cells would be washed off. 2. Fresh 24 hrs old culture should be used. Gram var

Aeolian-transported soil, Aeolian Wind transported materials constitute...

Aeolian Wind transported materials constitute this category. This can be further divided into dunes or loess. Dunes are found in thr& types of situations. Fitly, these may occu

What is the general chemical equation of photosynthesis, What is the genera...

What is the general chemical equation of photosynthesis? Why doesn't that equation clearly show the real origin of the molecular oxygen liberated? The general equation of photo

Meaning of gestational diabetes mellitus, Q. Meaning of Gestational Diabete...

Q. Meaning of Gestational Diabetes Mellitus? In this type of diabetes, increased blood sugar level is first diagnosed or recognized during pregnancy. Women are not known as dia

Define ion exchange chromatography, Define Ion exchange chromatography? ...

Define Ion exchange chromatography? In this method a reversible exchange of ions is effected. Usually resins and ionic solutes are the two components involved in ion-exchange.

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