What is the smallest human cell the white or red blood cell beside the spermatozoon?
The smallest arteries of the human body are the arterioles, which supply blood into the capillary network from the main arteries (artery-->arteriole-->capillary-->venule-->vein). They hold plasma and filtrates, and are usually only wide enough to hold a single red blood cell at a time (in some cases, they are smaller than a RBC).
cappillaries ============== The smallest veins in the body are the venules. Capillaries join venules and arterioles (the smallest arteries) together. Arteries carry the blood from the heart around the whole body; while veins carry the blood back to the heart. They are joined by the capillaries, where the most important actions happen. More information in related links.
The major organ in the body is the heart.The heart is an organ which pumps out blood and make the blood travel the whole body of a human.Your heart is in the middle of your chest between your lungs.Inside your heart are blood cells and many tubes where blood travels and also these tubes are connected to your capillaries (the smallest blood vessels in the human body).Not just the heart pumps,your pulse will also pumps.