How does the heart work GCSE PE?
The heart works as a dual action pump – two pumps that work at the same time to pump blood in two different directions. The right-hand side of the heart collects deoxygenated blood from the body and pumps it to the lungs (to collect more oxygen). This is called pulmonary circulation.
What are the 3 circuits of the heart?
The mammalian circulatory system is divided into three circuits: the systemic circuit, the pulmonary circuit, and the coronary circuit. Blood is pumped from veins of the systemic circuit into the right atrium of the heart, then into the right ventricle.
What is the cardiac cycle GCSE PE?
The cardiac cycle refers to the pattern of contraction and relaxation of the heart during one complete heartbeat. Contraction of the heart muscle is known as systole and relaxation of the heart muscle is called diastole.
What valves are in the heart GCSE PE?
The semilunar valves stop the back flow of blood into the heart. There is a semilunar valve where the aorta leaves the left ventricle and another where the pulmonary artery leaves the right ventricle.
How many valves does the heart have?
four heart valves
The four heart valves, which keep blood flowing in the right direction, are the mitral, tricuspid, pulmonary and aortic valves. Each valve has flaps (leaflets) that open and close once per heartbeat.
How is the heart adapted GCSE?
Adaptations of the heart There are two sets of valves inside the heart which function to prevent the backflow of blood in the heart: The atrioventricular valves separate the atria from the ventricles. The semilunar valves are found in the two blood arteries that come out of the top of the heart.
What is diastole and systole?
Diastole and systole are two phases of the cardiac cycle. They occur as the heart beats, pumping blood through a system of blood vessels that carry blood to every part of the body. Systole occurs when the heart contracts to pump blood out, and diastole occurs when the heart relaxes after contraction.