Circulatory system - blood vessels, Biology

Assignment Help:

BLOOD VESSELS -

Some vessles supply blood to wall of large vessels these are vessel of vessels or vasa vasorum.
Mainly artery and vein, 2 types of vessels present.
Third one is capillary - discovered by Marcillo Malpighi, thin, present in organ, only inner layer in wall present.
In man 10 billion capillaries present.
They may form 150,000 miles rope.
In vein blood flows mainly by contraction of body muscles & suction created by diastole of heart.
In wall of blood vessels 3 layers present.

1. Tunica Externa - Made up of connective tissue, collagen fibres present.

2. Tunica media - Thick, made up of smooth muscles arranged in circular way.

3. Tunica interna - Inner most layer. Outerly made up of yellow elastin fibre. Inner layer is of endothelial cells.

S.NO.

ARTERY

VEIN

10.

Carry blood away from heart

Pure blood flows

(in pulmonary artery impure blood flows)

Blood flows with jerk

Blood flows with more pressure

Walls are thick

Lumen is narrow

Not collapse after death

Deeply placed

Valve absent

Wall firm

Towards heart

Impure blood flows

(In pulmonary vein pure blood flows)

Steady

Less pressure

Thin

Broad

Collapse

Superficially placed

Present to check back flow

Elastic

Related Discussions:- Circulatory system - blood vessels

Explain the nutritional and functional role of iron, Minerals :- Iron ...

Minerals :- Iron Food Source Cereals, legumes, meat contamination from iron utensils and soil Nutritional Functional role Essential nutrient: Deficiency lead

Define natural gums - hydrocolloids, Natural Gums These are derived fro...

Natural Gums These are derived from various plant as well as microbial sources and are divided into the following four basic categories: 1. Seaweed gums: Agar, Alginate,

Cell, compare and contrast plant cell and animal cell with labeling diagram...

compare and contrast plant cell and animal cell with labeling diagrams

Aerobic respiration, Ask question end product of aerobic repiration ar...

Ask question end product of aerobic repiration are

Absorption of amino acids and peptides, Absorption of amino acids and pep...

Absorption of amino acids and peptides Generally, the dietary proteins are almost comp!etely digested to their constituent amino acids and these are rapidly absorbed from

Do you know about lateral lines of fishes, Q. What are the lateral lines of...

Q. What are the lateral lines of fishes? The lateral lines of bony fishes are sense organs that extend along both sides of the animal body they make contact with the environmen

Epithelial tissue, EPITHELIA L TISSUE OR EPITHELIA Epithelium term coi...

EPITHELIA L TISSUE OR EPITHELIA Epithelium term coined by Ruysh, it was applied originally to thin skin covering the nipple. (G.epi = upon, thele = nipple) Epithelial tis

Principles of numerical taxonomy, Q. Principles of Numerical Taxonomy? ...

Q. Principles of Numerical Taxonomy? Numerical taxonomy is based on the following 7 principles. 1) The greater the content of information in the taxa of a classification is an

Define deficiency and toxicity of vitamin d, Define Deficiency and Toxicity...

Define Deficiency and Toxicity of Vitamin D? Infants constitute a population at-risk for vitamin D deficiency because of relatively large vitamin D needs brought about by their

What are the dietitians services, What are the dietitians services Diet...

What are the dietitians services Dietitians are engaged in a variety of positions and in a number of work settings. Of course the largest proportion is involved engaged in

Write Your Message!

Name

Email id

Message

Verfication Code

User Account

All Pages