Circulatory system - blood vessels, Biology

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

1.

 

2.

 

 

 

3.

 

4.

 

5.

 

6.

 

7.

 

8.

 

9.

 

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

Posted Date: 10/2/2012 12:39:15 AM | Location : United States







Related Discussions:- Circulatory system - blood vessels, Assignment Help, Ask Question on Circulatory system - blood vessels, Get Answer, Expert's Help, Circulatory system - blood vessels Discussions

Write discussion on Circulatory system - blood vessels
Your posts are moderated
Related Questions
Define Eosin - Methylene Blue (EMB) Agar (Levine) Peptone - 10.0 gm Lactose - 5.0 gm Dipotassium - 2.0 gm Hydrogen Phosphate Agar - 13.5 gm Eosin Y - 0.4 gm M

Protraction from HIV  Under the following conditions HIV is not transmitted 1) The secretions and body fluids like Saliva, Tears, Sweat, Faeces, and Urine have negligible HIV c


"Height" is an example of a gene, but "Short" is an example of...

SPECIAL FEATURES

Explain Healthcare Burden OF HEART DISEASES? CAD and its complications use up a substantial portion of the scarce healthcare resource of the country. It has been reported that

hi there,i would like u to help me with understanding Hutchinson phyletic dieta

Anomalies Related to Oral Cavity: Under these anomalies we will briefly discuss the cleft lip and cleft palate.  You must have seen and/or nursed a baby born with a cut on

Define Function of the Iron Uptake by Cells? Iron has several vital functions in the body. It serves as a carrier of oxygen to the tissues from the lungs by red blood cell haem

Define about the Composition of Body Weight? You might have read in previous units that our body weight is composed of muscle bone and fat. Segregating these components of body