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

Types of drug action, TYPES OF DRUG ACTION - 1 . PHARMACODYNAMI...

TYPES OF DRUG ACTION - 1 . PHARMACODYNAMIC DRUGS - These drugs modify the physiological and biochemical processes in the patient's body to eliminate the disease.

Sterility in angiosperms, Sterility in Angiosperms Sterility in angios...

Sterility in Angiosperms Sterility in angiosperms may arise due to several causes. Either the anther may not be formed, or anthers are formed but meiosis may be abnormal. A

Define the diet intervention for lactose intolerance, Define the Diet inter...

Define the Diet intervention for lactose intolerance? Lactose is present in dairy products such as milk, cheese, yoghurt, ice cream etc. Hidden sources of lactose may include

How to load glycogen, How to load glycogen? Over the past fifty years, ...

How to load glycogen? Over the past fifty years, the biggest breakthrough was the discovery of how to load glycogen and sophistication in the methods of glycogen loading. Nitro

Special property of a persistent insecticide, a) What is the special proper...

a) What is the special property of a 'persistent' insecticide? b) In what ways is 'persistence' (i) a useful property, (ii) a harmful property? (a) A persisten

Genetics, what is a homologous chromosome

what is a homologous chromosome

Name the restricted food items, Restricted Food Items Foods to be avoid...

Restricted Food Items Foods to be avoided by diabetic patient are carbohydrate and fatty food. Carbohydrates are classified into sugars and starches. As you have studied in und

Protoplasmic theory, Protoplasmic Theory The living matter which forms ...

Protoplasmic Theory The living matter which forms the bodies of all living being is a special type of highly organized jelly like viscous semi fluid, and named Sarcode by Dujar

Ttt, respiration.

respiration.

Determine the pre-conditions for gtt, Pre-conditions for GTT You are ad...

Pre-conditions for GTT You are advised to carry out the GTT (OGTT) test to confirm a diagnosis of diabetes mellitus for a person with: a) The history of glycosuria (glucose

Write Your Message!

Name

Email id

Message

Verfication Code

User Account

All Pages