2 Title:The HeartLearning outcomes:Describe the role of the heart in the circulatory system.Explain the differences between arteries, veins and capillaries, by relating their structure to their function.Explain the role of coronary arteries.Describe what is coronary heart disease.
3 Keywords for the heartAtrium (ae-tree-um) – the first chamber into which blood enters.Ventricle (ven-trik-al)– the lower chambers of the heart. Blood is pumped from these.Arteries – Blood vessels that take blood away from the heart.Veins – Blood vessels that bring blood back to the heart.Capillaries – the smallest blood vessels. Where Oxygen and nutrients leave the blood andCoronary arteries – arteries that wrap around the heart
6 Double circulatory system A double circulatory system separates the oxygenated and the deoxygenated blood.The pulmonary circuit pumps blood to the lungs.The systemic circuit pumps blood to the body systems (i.e. The head, limbs, and trunk).
7 Double circulatory system The right ventricle pumps blood through the shorter pulmonary circuit.The left ventricle pumps blood through the longer systemic circuit.As a result, the left ventricle’s walls are thicker and stronger.
8 The flow of blood around the body Arteries take blood away from the heart.Veins take blood to the heart.
11 Coronary Arteries The heart is made of muscle cells. Just like other cells in the body, these heart cells need a supply of oxygen and nutrients.Coronary arteries deliver blood containing oxygen and nutrients to the heart.
12 Describe how blood circulates around the body. Heart pumpsCardiac muscle contractsVentricles fillBlood forced out under pressureLHS of heart strongerOxygenated blood pumped to organs of the body from LHSRHS pumps deoxygenated blood to the lungsBlood under pressure from the heart passes through arteriesBlood returning to the heart flows through veinsBlood moves from arteries to veins through capillaries.
14 cardiac cycleThe cardiac cycle is the sequence of events that occurs when the heart beats.There are two phases: diastole and systoleIn the diastole phase, the heart ventricles are relaxed and fill with blood. In the systole phase, the ventricles contract and pump blood to the arteries.