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

What is the energy source used in active transport, What is the energy sour...

What is the energy source used in active transport through biological membranes? The energy essential for active transport (against the concentration gradient of the transporte

Show the major proteins that constitute the sarcomere, Q. What are the majo...

Q. What are the major proteins that constitute the sarcomere? What is the function of those molecules in the muscle cells? In the sarcomere there are organized myosin and actin

Where is the gall bladder located, Where is the gall bladder located? T...

Where is the gall bladder located? The gall bladder is located in the Upper Right Quadrant (URQ) of the abdomen just below the liver. It keeps bile secreted by the liver. The d

Insulin and its functions, People with Type 1 DM produce no insulin. People...

People with Type 1 DM produce no insulin. People with Type 2 DM do not always produce enough insulin. Insulin is used medically to treat some forms of diabetes mellitus. Patients w

Carbohydrate metabolism, CARBOHYDRATE METABOLISM Carbohydrates are br...

CARBOHYDRATE METABOLISM Carbohydrates are broken down into monosaccharides which are absorbed into the blood stream. In the liver and muscles, most of the glucose is

Vitamin - d, VITAMIN - D Also known as Calciferol / Anti ricket vit...

VITAMIN - D Also known as Calciferol / Anti ricket vitamin / sun shine vitamin. It is necessary for bones & teeth. It is synthesized in presence of UV rays of sunl

Describe RNA Structure, The basic parts of RNA are the same than for DNA wi...

The basic parts of RNA are the same than for DNA with two major differences. The pyrimidyne base uracil exchange thymine and ribose replace deoxyribose see the sugar, pyrimidines a

Explain about the biosensors and caramelization, Explain about the Biosenso...

Explain about the Biosensors and Caramelization? Biosensors: A device that utilizes biological materials to monitor the presence of several chemicals in a substance. Carame

What is pulse rate, Pulse Each time the left ventricle contracts and fo...

Pulse Each time the left ventricle contracts and forces blood into the aorta, it expands to adjust additional blood. And blood already present is pushed to other section and al

Find the genotypes and phenotypes of the f1, Determine the genotypes and ph...

Determine the genotypes and phenotypes of the F1 generation from a colour blind father and a mother who is homozygous for normal colour vision.

Write Your Message!

Name

Email id

Message

Verfication Code

User Account

All Pages