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 environmental factors influencing food production, Explain Environm...

Explain Environmental Factors influencing food production? You probably know that no agricultural region has a constant climate throughout the year. This is true even in the tr

Define principle for iodine number estimation - lipids, Define Principle fo...

Define Principle for Iodine Number Estimation - Lipids? Iodine number is defined as the number of grams of iodine absorbed by 100 grams of fat, it gives an idea of the relative

Define glycogen , A glycogen molecule having entirely of glucose uni...

A glycogen molecule having entirely of glucose units, many of that are linked in long chains through α1-4 bonds. Furthermore, every 10 units or so, the chain is branched

Tissue culture, Note on production of haploid by tissue culture.

Note on production of haploid by tissue culture.

Define water as a source of dietary minerals, Define Water as a source of d...

Define Water as a source of dietary minerals? Although water is composed of only oxygen and hydrogen, the water we drink or use in food preparation can contain significant amou

Explain cloning vector, Cloning vector: The DNA molecule originating from ...

Cloning vector: The DNA molecule originating from the virus, a plasmid, or the cell of a higher organism into which an another DNA fragment of appropriate size can be integrated w

What is alleles, Whenever a pair of alleles has different alleles is there ...

Whenever a pair of alleles has different alleles is there dominance between them? Not in all cases of a gene having two different alleles is the dominance complete. There are g

#phylum coelenterata, #what is coelenterata?

#what is coelenterata?

Define drawbacks for underwater weighing method, Define drawbacks for under...

Define drawbacks for underwater weighing method? Since the major drawbacks with UWW method are that the subject needs to be totally submerged underwater and exhale all of the a

What is natural selection, What is natural selection? Natural selection...

What is natural selection? Natural selection is the method by which organisms that have certain favorable traits are better capable to survive and make successfully than organi

Write Your Message!

Name

Email id

Message

Verfication Code

User Account

All Pages