Cardiovascular System

The heart, blood and blood vessles make up this system. It is in charged of supplying all living cells in the body with oxygen and nutrients.

Blood

10 pints of this fluid conective tissue circulates around the average human. Blood consists of three main things, red blood cells, white blood cells and plasma. It is made 45% up of cells and 55% plasma. Plasma is a yellowish liquid that contians water, protien and other solutes. Red blood cells contian hemoglobin, a protien that cairies oxygen around the body while white blood cells fight infections. Niether of these cells have a nueclous.

Heart

The heart is the organ that powers the cardiovascular system. It is located between your lungs and is the size of a fist. A heartbeat is a three step process. First the atria fills with blood, then the atria contracts spilling the blood into the ventricle, finnaly the ventrical contracts pushing the blood out of the heart. A heart beats 60 times per minute.

Karl Landstiener

He was an immunologist that made blood transfusions less risky by discovering the blood groups (the ABO system).