Unit 1: The Heart Flashcards
How do you calculate cardiac output?
Stroke volume x Heart rate
What is cardiac output?
The amount of blood pumped around the body
What are the atria?
They’re chambers which stretch as blood collects and pumps the blood a short distance to the ventricles so it only has thin muscular walls
What are the ventricles?
Chambers with thick muscular walls that pump a far distance either to the lungs or body
What’s another name for the left atrioventricular valve?
Bicuspid valve
What’s another name for the right atrioventricular valve?
Tricuspid valve
Where does the Aorta take blood?
To the body from the left ventricle
Where does the vena cava take blood?
To the right atrium from the body
Where does the pulmonary artery take blood?
To the lungs from the right ventricle
Where does the pulmonary vein take the blood?
To the left atrium from the lungs
Why does the left wall of the heart have thicker muscular walls?
It’s has to pump blood around the whole body
What does a blockage of the coronary arteries lead to?
Myocardial infarction (heart attack)
Why does a heart attack occur if the coronary arteries are blocked?
The heart muscle is deprived of oxygen and so dies
In the cardiac cycle what is diastole?
The semi lunar valves are closed but the atrioventricular valves are open as the atria are full with blood
In the cardiac cycle what is atrial systole?
Where the atria contract to push blood into ventricles, atrioventricular valves are open but the semi lunar are closed
