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

Describe two differences among green algae and red algae, Some biologists p...

Some biologists prefer to categorize brown, red, and some green algae as plants rather than protists. What characteristics of these algae support like classification? Brown and

Salt glands in birds and reptiles, Salt Glands in Birds and Reptiles M...

Salt Glands in Birds and Reptiles Marine reptiles for example, iguanas, estuarine sea turtles, crocodiles, sea snakes and marine birds like the marine teleosts do not produce

Explain process of stress testing in women, Q. Explain process of Stress Te...

Q. Explain process of Stress Testing in Women? Estrogen has been implicated as a cause of ST depression. For years it seemed that estrogen protect women from coronary artery di

Cleft grafting, Cleft grafting The stem of the stock is cut across....

Cleft grafting The stem of the stock is cut across. A 'V' shaped insertion is made at the end of the stock. The scion is cut in shape. The scion is inserted into the 'V'

Light and dark reactions, Evidence for Existence of Light and Dark Reaction...

Evidence for Existence of Light and Dark Reactions The process of photosynthesis was known in its bare outline already at the beginning of this century. But the phenomenon wa

Establishment of tissue cultures, Establishment of Tissue Cultures By...

Establishment of Tissue Cultures By now you are familiar with the term "Explants". After a few days in culture the explant becomes slightly rough in texture and its surface g

Ammonification, Ammonification Many heterotrophic bacteria actinomycet...

Ammonification Many heterotrophic bacteria actinomycetes and fungi in soil and water metabolise the organic nitrogen and release it in an inorganic form as ammonia. This proce

Pollen tube growth, Pollen Tube Growth There are significant differen...

Pollen Tube Growth There are significant differences in the fine structure of the tips of pollen tubes in compatible and incompatible pistils such as Lilium. Tubes growing in

Find the magnitude of the acceleration, A proton accelerates from rest in a...

A proton accelerates from rest in a uniform electric field of 650 N/C. At some later time, its speed is 1.3 106 m/s. Find the magnitude of the acceleration of the proton. M/s2

Define about the carbohydrates - nutritional biochemistry, Define about the...

Define about the Carbohydrates - nutritional biochemistry? Carbohydrates, you should observe by now, are made up of carbon, hydrogen and oxygen only with hydrogen and oxygen at

Write Your Message!

Name

Email id

Message

Verfication Code

User Account

All Pages