structure of the heart Flashcards
what side pumps deoxygenated blood
right
what side pumps oxygenated blood
left
what kind of walls does the left ventricle have and why
thicker and more muscular walls it allows it to contract more powerfully and pump blood all around body
what are the walls like in the right ventricle and why
less muscular so the contraction are powerful enough to pump blood to lungs
what are the ventricle walls like compared to the atrium and why
more thicker so they can push blood out of heart whereas atrium needs to push blood to ventricle (short distance)
what does the artioventricular (AV) valve link
atrium to the ventricles
what does the AV valve do
stop blood flowing back into atrium when ventricles contract
what does the semi-lunar (SL) valve link
ventricles to pulmonary artery and aorta
what does the SL valve do
stop blood flowing back into the heart after ventricles contract
what do the cords attach
AV valves to the ventricles
what do the cords do
stop them being forced up into the atrium when ventricles contract
what way do the valves open
one way
open or closed valves depends on what
relative pressure of the hear chambers
when is the valve open
when there is higher pressure behind the valve (in ventricle)
when is the valve closed
when there is a higher pressure infront of the valve (in atrium)
