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

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


Related Discussions:- Circulatory system - blood vessels

Energy flow - ecosystem, Energy Flow - Ecosystem Our world is a solar-...

Energy Flow - Ecosystem Our world is a solar-powered system, and green plants are the entry gates of energy into ecosystem. The total incoming solar energy, only a very small

Define bioavailability of pyridoxine, Define Bioavailability of pyridoxine?...

Define Bioavailability of pyridoxine? A recent review by Gregory confirms that bioavailability of vitamin B 6 in a mixed  diet is about 7570, with approximately 8% of this tot

Objectives of dietary management of myocardial infarction, Q. Objectives of...

Q. Objectives of dietary management of myocardial infarction? The objectives of dietary management of myocardial infarction patients are as follows: - To provide rest to the

BLOOD CELLS, What is the function of platelets?

What is the function of platelets?

How rapidly a person breathes, Considering the nature of negative-feedback ...

Considering the nature of negative-feedback control and the function of the respiratory system, what effect do you predict that a decrease in CO2 in the internal environment would

Xerarch - ecology, Xerarch - Ecology Successions initiated on bare roc...

Xerarch - Ecology Successions initiated on bare rock, wind-blown sand, rocky talus slopes, or other situations where there is an extreme deficiency of water are termed xerarch

Lung abscess, Lung Abscess: Lung  abscess  is a localised collection o...

Lung Abscess: Lung  abscess  is a localised collection of pus in  the pulmonary parenchyma as a result of  suppuration and necrosis. The obstruction  of the bronchus of the in

Do enzymes act better under acid or basic ph, Do enzymes act better under a...

Do enzymes act better under acid or basic pH? Most enzymes act in pH among 6 and 8, a range that corresponds to the general acidic level of cells and blood. There are enzymes,

Illustrate ploidies of zygote, Q. What are the respective ploidies of zygot...

Q. What are the respective ploidies of zygote, gamete and somatic cells in a species with gametic meiosis? Adopting as pattern an "x" quantity of chromosomes for gametes, somat

Zoology , phylum platyhelminthes

phylum platyhelminthes

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd