*IN THIS LESSON WE WILL DISCUSS ABOUT BLOOD VESSELS..!!
VESSELS OF CIRCULLATORY SYSTEM ON THE BASIS OF STRUCTURAL DIFFERENC
ARE FOLLOWINGS TYPES;
1)Aorta
2)Arteries
3)Arterioles
4)Capillaries
5)Venules
6)Venae
cavae
Now first we
discuss about;
1)ARTERIAL SYSTEM.;
· It consists of aorta,
arteries, and arterioles.
AORTA and Arteries are formed by three layers.
1)OUTER-----Tunica Adventitia
2)Middle----Tunica Media
3)INNER-----Tunica Intima
- As blood vessels move away from heart their walls becomes narrower and their walls become thinner.
- Maximum diameter of AORTA is 25 millimeter and minimum diameter of arterioles is 10 micrometer after that CAPILLARIES are started.
Now we discuss about;
2)CAPILLARIES ;
Capillaries
are;
· Thin walled vessels.
· They have diameter about 5 to 8 micrometer.
· They are functionally very important because all the exchange of material between the blood and the tissues occurs through capillaries.
3)VENOUS SYSTEM;
· They have diameter about 5 to 8 micrometer.
· They are functionally very important because all the exchange of material between the blood and the tissues occurs through capillaries.
3)VENOUS SYSTEM;
When capillaries end then venous system starts.
·
VENOUS SYSTEM include;
1)venules
2)veins
3)venae cavae
- After capillaries the diameter of the blood vessel start to increase and capillaries end in VENULES and the diameter of venules are about 20 micrometer.
- Venules are continued as Veins which have diameter of about millimeter.
- veins ends in superior and inferior venae cavae which have diameter of about 30 millimeter.