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

List down the various mycotoxins associated with food, Q. List down the var...

Q. List down the various mycotoxins associated with food? Mycotoxins associated with foods are: • Aflatoxins (produced by Aspergillus flavus) • Ochratoxin (produced

Adaptations, Adaptations Every organism can live and reproduce within a...

Adaptations Every organism can live and reproduce within a certain range of climatic conditions. Organisms that live in hot or cold environments have behavioural and physiologi

Define heterochromatin, Heterochromatin: Compact, gene-poor areas of a gen...

Heterochromatin: Compact, gene-poor areas of a genome, which are enriched in the simple sequence repeats. As it may be impossible to clone, heterochromatin is generally ignored wh

Phylum protozoa, what arr the economic importance of phylum protozoa

what arr the economic importance of phylum protozoa

Breifly describe the menstrual cycle, Breifly describe the Menstrual Cycle?...

Breifly describe the Menstrual Cycle? Each month during a female's reproductive years, the hypothalamus secretes a hormone that stimulates the anterior lobe of the pituitary gl

Name the various test batteries, Name the various Test batteries Test ...

Name the various Test batteries Test batteries typically assess the following domains: General cognitive ability Language ability Visuoperceptual and constructi

Homogeneity to the nucleic acid chains, Q. Do the phosphate and the pentose...

Q. Do the phosphate and the pentose groups give heterogeneity or homogeneity to the nucleic acid chains? What about the nitrogen- containing groups? Supported by that, which of tho

Carbon dioxide in the atmosphere, Which part of the carbon cycle is respons...

Which part of the carbon cycle is responsible for the enhancing concentration of carbon dioxide in the atmosphere. The burning of fossilized products (coal and oil) of some pla

Explain clear liquid diet, Explain Clear Liquid Diet Clear Liquid Die...

Explain Clear Liquid Diet Clear Liquid Diet: It is composed of foods with low residue content which help to minimize the load of food needing digestion in the int

Diagnosis of galactosemia, Diagnosis of galactosemia is by measuring the ac...

Diagnosis of galactosemia is by measuring the activity of gal-l-P-transferuse in erythrocytes. Galactose should be restricted if the gal-1 -P-transferase is elevated above 2 mg/dl.

Write Your Message!

Name

Email id

Message

Verfication Code

User Account

All Pages