The heart Flashcards
How many chambers does the heart have and name them
4 Chambers
Left atrium, Right atrium, Left venticle, Right Ventricle
Pulmonary vein
The heart receives oxygenated blood from the lungs through the pulmonary vein.
In the first circuit the heart pumps deoxygenated blood to the lungs to take oxygen
In the second circuit the heart pumps oxygenated blood around all the other organs to deliver oxygen to the body cells
Vena cava
The heart receives deoxygenated blood from the body through a vein called the vena cava.
Aorta
The heart pumps out oxygenated blood to the body through the aorta.
Pulmonary artery
The heart pumps out deoxygenated blood to the lungs through the pulmonary artery.
Coronary arteries
The coronary arteries supply the heart muscle with oxygenated blood.
How is cardiac output calculated
Cardiac output is calculated by multiplying the heart rate (normally about 75 beats per minute in humans) by the stroke volume (which is the volume of blood pumped by each ventricle with each heartbeat).
Specifically, cardiac output is the volume of blood pumped each minute by each ventricle.
Why is the human circulatory system called a double circulatory system?
The human circulatory system is called a double circulatory system because blood passes through the heart twice per circuit.
Why does the left ventricle have a thicker wall?
The left ventricle has a thicker wall than the right ventricle as it needs more muscle because it has to pump blood around the whole body at high pressure
Right atrium
The right atrium of the heart recieves deoxygenated blood from the body (through the vena cave)
Right ventricle
The deoxygenated blood moves through to the right ventricle, which pumps it to the lungs (through the pulmanory artery)
Left atrium
The left atrium recieves oxygenated blood from the lungs (through the pulonary vein)
