Compendium Review Oxygen, Microbes, Immunity

clipped from two2tango11.blogspot.com There are two main structures that make up the cardiovascular system: the heart and the blood vessels. The heart pumps the blood through the blood vessels. Circulation provides service to the cells by exchanging substances with tissue fluid which the actual cells are bathed in. Blood is able to perform this way by stopping at three main organs. The lymphatic system works hand in hand with the cardiovascular system by collecting excess tissue fluid and giving it back to the cardiovascular system. Water that collects in tissues during exchanges is called lymph as soon as it enters the lymphatic vessels. The heart is a muscle that sits between the lungs, behind the sternum. The myocardium is made of cardiac muscle tissue. The coronary artery and the cardiac vein service the myocardium. Each heartbeat is a cardiac cycle. A pulse is equal to heart rate. Blood pressure is measured using a sphygmomanometer. The first circuit is the pulmonary circuit, where blood circulates through the lungs.