Physiology Describe function smooth muscle to area ratio and

Physiology

Describe function, smooth muscle to area ratio, and pressures of following vessles:

-arorta

-arteries

-arterioles

-capillaries

-venules

-veins

-vena cava

Solution

Thanks for the question

Aorta - the aorta is from where the left ventricle of the heart pumps out blood from the heart to the vascular system. The aorta divides into the ascending aorta which carries blood to the upper part of the body and the descending aorta which carries blood to the lower part of the body. The blood pressure bp in the aorta is around 80-120mmHg

Arteries - the arteries enter into the different organs in the body and supply them with blood. The pressure here is around 80-120 mm Hg

Arterioles - Inside the organs the arteries divide themselves into further branches to adequately supply all parts of the organs. The pressure here is around 60-80 mm Hg

Capillaries - the capillaries form a joint between arterioles and venules. this is from the blood flow ends in the arteriolar system and enters the venous system. the pressure here is around 20-4- mm Hg

Venules - The venules collect blood from the different parts of the organs and drain them into the veins. the bp here is around 2-10 mm Hg

Veins- The veins collect the blood drained from different organs and drain them into the superior and inferior vena cava. The pressure here is around 0 mm Hg

Vena cava- the superior vena cava drains blood from upper part of the body and the inferior vena cava drains blood from the lower part of the body. the bp here is around 0mmHg.

area ratio is 1.15 for larger arteries and drops to 1.35 for smaller arteries. It also varies with age, atheresclerosis etc

Regards