The cardiovascular system contains the heart, blood vessels, and blood. This mechanism delivers oxygen and nutrients to cell throughout the body and also carries waste far from them. Together a result, that is regularly referred to together the "transportation system" of the body. The cardiovascular system performs this functions:•Supplies nutrients and also oxygen come the body•Removes metabolic waste and carbon dioxide indigenous cells•Distributes hormones and antibodies transparent the body•Helps control body temperature and also electrolyte balance
The heart is a two-sided, hole organ around the size of a fist. That is located between the lung in the thoracic cavity and also behind the sternum, slightly to the left. The heart has three class of tissue.•The pericardium is a twin membrane, or sac, that covers the external of the heart. It consists of a lubricating fluid that reduces friction together the heart beats in stimulate to prevent tissue damage.•The myocardium is the center layer, and also the thickest one. That is make of muscle tissue and also pumps the blood v the system.•The endocardium is a smooth great of cells that lines the inside of the heart and the blood vessels. It enables for the blood to flow smoothly through the system.

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The heart is separated into the right and also left sides by a thick, muscular wall called the septum. Every side is divided into two components to produce four chambers in total. The top two chambers are referred to as atria, and also the bottom two are referred to as ventricles. The blood enters the heart v the atria and leaves through the ventricles.
Four valves in the heart store the blood flow in just one direction.•Atrioventricular valves are located between the atria and also the ventricles on every side of the heart. These 2 valves incorporate the tricuspid valve top top the ideal side and the bicuspid valve, or mitral valve, on the left.•Semilunar valves room located in between the ventricles and also the vessels whereby blood pipeline the heart. These two valves encompass the pulmonary valve and the aortic valve.
The flow of blood between the heart and also the lungs is dubbed pulmonary circulation. The ideal side that the heart pumps deoxygenated, or oxygen-poor, blood to the lungs. In the lungs, carbon dioxide is exchanged because that oxygen. Climate the oxygenated, or oxygen-rich, blood return to the left next of the heart.The flow of blood in between the heart and the cell of the body is dubbed systemic circulation. The left side of the heart pumps the oxygenated blood to the remainder of the body. The blood return from the body to the best side that the love to maintain consistent circulation.
When deoxygenated blood returns from the body, it follows this path through the heart.1.The appropriate atrium receive deoxygenated blood native the body through the inferior and superior vena cava.2.The blood moves to the lower section of the heart through the tricuspid valve. The valve stays clear of blood from moving earlier into the appropriate atrium.3.The ideal ventricle fills through blood.4.The right ventricle contract to send the blood through the pulmonary valve come the pulmonary artery and also the lungs. The valve stays clear of blood from return to the best ventricle.5.The left atrium obtain oxygenated blood native the lungs with the pulmonary veins.6.The blood moves to the lower portion of the heart v the bicuspid (mitral) valve. The valve avoids blood from moving ago into the left atrium.7.The left ventricle fills with blood.8.The blood leaves the heart through the aortic valve come the aorta, which sends the blood to all components of the body. The valve prevents blood from return to the left ventricle.

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Electrical impulses starting in the heart cause the muscle to contract and the love to beat. Just the heart contains muscle organization that have the right to stimulate its own contractions.The right and left sides of the heart work-related together in a bicycle to develop a heartbeat. First, the atria contract and also push blood right into the ventricles. The atria then relax, and also as they are filling through blood, the ventricles contract and also send blood to the parts of the body.
Like the heart, muscle tissue in the remainder of the body deserve to stimulate its very own contractions with electrical impulses. True or False?