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

Digestive system in planarias, Q. How are nutrients distributed through the...

Q. How are nutrients distributed through the digestive system in planarias? Planarias have single opening digestive system incomplete with ramifications that transport nutrient

Evaporative cooling, Normal 0 false false false EN-IN ...

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

Stomach, Describe about the stomach

Describe about the stomach

Explain about mental foramen and nerve, Explain about Mental foramen and ne...

Explain about Mental foramen and nerve Mental foramen is a strategically important landmark during osteotomy procedures. Its location and the possibility that an anterior loop

Multiple alleles, MULTIPLE ALLELES (i) More than two alternativ...

MULTIPLE ALLELES (i) More than two alternative forms (alleles) of a gene in a population occupying the same locus on a chromosome or its homologue are known as multiple

What is the intermediate host of schistosoma mansoni, Q. What is the interm...

Q. What is the intermediate host of Schistosoma mansoni? Where does that host live? The intermediate host of a schistosome is a gastropod mollusc, Biomphalaria genus and a snai

Define the criteria for an indicator organism, Define the Criteria for an I...

Define the Criteria for an Indicator Organism? Following criteria are suggested for an indicator organism: i. It should be suitable for the analysis of all types of water, i

What is the concept of universality of the genetic code, What is the concep...

What is the concept of universality of the genetic code? What are the exceptions to this universality? The genetic code is universal because the rules of protein codification b

Physical properties of protoplasm, What is the physical experiment that sho...

What is the physical experiment that show that the protoplasm has contractility?

Elaborate extracorporial in detail, Elaborate Extracorporial in detail. ...

Elaborate Extracorporial in detail. Outside of the body. An example is extracorporial digestion found in some animals where digestive enzymes are regurgitated into food. Once i

Write Your Message!

Name

Email id

Message

Verfication Code

User Account

All Pages