The Heart Flashcards
closed circulatory system
blood is pumped around the body and is always contained within a network of blood vessels
open circulatory system
blood is inside the body cavity and bathes the organs
what are the right atrium and right ventricle separated by
atrioventricular (AV) valve known as the tricuspid valve
what is the left atrium and left ventricle separated by
another AV known as the bicuspid valve
what is the right ventricle and the pulmonary artery separated by
by a semilunar (SL) valve known as the pulmonary valve
what is the left ventricle and aorta separated by
SL valve known as the aortic valve
when does the valve open
pressure of blood behind them is greater than the pressure in front of them
when does the valve close
pressure of blood in front of them is greater than the pressure behind them
what does valve tendon / cords do
prevent the valve from flipping inside out
left ventricle
thicker muscle than on right ventricle because it has to pump blood all around body
ventricles
thicker than atria as it has to pump blood out of the heart
atrioventricular valve
prevent back flow of blood from ventricles into atria
semilunar valve
prevent back flow from aorta or pulmonary artery into ventricles
what is the vena cava
brings blood from the body
what is the pulmonary vein
brings blood from the lungs