Red blood cells are thus much more common than the other blood particles: there are about 4,000â11,000 white blood cells and about 150,000â400,000 platelets in each microliter of human blood. Human red blood cells take on average 20 seconds to complete one cycle of circulation.
Â­Â­Your kidneys receive the blood from the renal artery, process it, return the processed blood to the body through the renal vein andÂ­ remove the wastes and other unwanted substances in the urine. Urine flows from the kidneys through the ureters to the bladder. In the bladder, the urine is stored until it is excreted from the body through the urethra. Now let's take a look inside your kidneys.
As the Cardiovascular system moves the plasma throughout the body it enters into the kidneys. The kidneys (Part of the Genitourinary system) filter the blood, removing excess water and any waste, converting it into urine. Initially too much water is removed and some of it needs to be reabsorbed. To regulate this the Pituitary gland (part of the Endocrine system, although being located in the brain- which is part of the nervous system) releases a hormone known as Antidiuretic hormone, which will facilitate reabsorption of water in part of the kidneys (not getting into specific anatomy here), bringing it back into the blood stream.