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Cardiovascular
Jun 22, 2017

The heart is a hollow muscle organ, located in the middle of the chest, separated by a partition between the two chambers, each chamber is divided into the upper part of the atrium and lower part of the ventricle. Atrial collection into the heart of blood, ventricular ejection out of mind. Ventilation and outlet of the valve have a valve to ensure that the blood flow in one direction. The human body in different physiological conditions, the various organs of the different levels of metabolism, the need for blood flow is also different. Cardiovascular activity in the body's nervous and humoral mediation, the change in cardiac output and peripheral resistance, coordination of the distribution of blood flow between the various organs to meet the various organs and tissues of the blood flow needs.