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

The iodine test, why is it necessary to grind food before the testng?

why is it necessary to grind food before the testng?

Name the associated foods used in bacillus cereus, Name the Associated Food...

Name the Associated Foods used in bacillus cereus Cereal dishes that contain corn and corn starch, mashed potatoes, vegetables, minced meat, liver sausage, milk, cooked meat.

Explain the importance the relationship of structure, Explain the importanc...

Explain the importance of understanding the relationship between structure and function?

Isolation techniques, Differentiate between spread plating and streaking?

Differentiate between spread plating and streaking?

How low birth weight cause protein energy malnutrition, How Low Birth Weigh...

How Low Birth Weight cause Protein Energy Malnutrition? The beginning of PEM in children starts in US from the time of their birth. At least a third of the Indian children are

VIRUSES, Antiviral activity

Antiviral activity

Entamoeba histolytica, Entamoeba Histolytica Losch (1875), for the fir...

Entamoeba Histolytica Losch (1875), for the first time, described the disease symptoms of infection of Entamoeba histolytica. However, it was only in 1903 that Schaudin gave t

Parazoa, parazoz????

parazoz????

What are biotic factors, What are biotic factors? The Biotic factors ar...

What are biotic factors? The Biotic factors are living beings (plants, microorganisms and animals) that are part of a given environment.

Living beings are made of inorganic and organic substances, Q. Living being...

Q. Living beings are made of inorganic and organic substances. According to the molecular complexity how can each of those substances be classified? Inorganic substances, mole

Write Your Message!

Name

Email id

Message

Verfication Code

User Account

All Pages