Mr. Helms was admitted to the hospital with chest pains and shortness of breath. His wife was panicked since her 72-year-old husband had a history of heart disease. After examination and an echocardiogram, Dr. Collins spoke with Mrs. Helms. "I'm very sorry, but your husband has had another heart attack resulting in valve failure. A papillary muscle that controls a valve in his heart has been severely damaged and is no longer working."

1. What is the purpose of blood flow?

2. Describe blood flow through the heart starting with blood entering the right side of the heart and including all chambers and valves.

1 - the purpose of blood flow-circulatory system - is to convey Oxygenated blood, oxygen bonded with haemoglobin in the RBC with Nutrients - and distributed these through the arteries and capillaries away from the heart, to reach the cells and tissues, and transported the wastes of theses cells and tissues, with C02 through the veins back to the heart and the kidney.

2. During diastole, deoxygented blood from the inferior and superior vena cavae entering the R. atrium, passes through the tricuspid valve into the Right Ventricle. Simultaneously, oxygenated blood returning through the pulmonary veins enters the left Atrium, emptied through the bicuspid valve into the Left. Ventricle.

During systole, the two ventricles contracts. The Right ventricle contracts, the pressure of the blood forces the tricuspid valve to close, and therefore de - oxygenated blood pushes the pulmonary valves to open and blood passes through the pulmonary artery to reach the lungs where exchanges of oxygen with carbon dioxide occurs. The blood is now oxygenated and returns to the left atrium via pulmonary veins.

Simultaneously, the left ventricle contracts, the oxygenated blood it contains forced the bicuspid valve to close so that blood is forced through the aortic valve to empty into the aorta into the systemic circulation, branches of the carotid artery supplies the heart from the aorta.

The Whole cycle continues.