What is the main function of the circulatory system?

transport oxygen and nutrients to the tissues which are needed for metabolismtransport waste products from cellular metabolism to kidneys and other excretory organs for eliminationcirculates electrolytes and hormones needed for regulation of various bodily functions

What are the two parts of the circulatory system?


What returns deoxygenated blood to the heart?


What contains valves which prevent backflow of blood when heart relaxes?


Do arteries or veins have larger lumens?


What is the largest vein which returns blood into the right atrium of the heart?

vena cava

What do the lower extremity venous system consists of?

superficial veinsdeep channels

What carries oxygenated blood from the heart to the tissues?


Which has thicker and stronger walls, needed to handle higher blood velocity flowing from the heart?
a) arteries
b) veins

a) arteries

What is the largest artery which originates at the left ventricle of the heart?