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The structure of the heart
· The atrium is thin-walled and elastic and stretches as it collects blood. It only has
to pump blood a short distance to the ventricle and therefore it has a thin
muscular wall.
· The ventricle has a much thicker muscular wall as it has to pump blood a long way.
Because the right ventricle pumps blood to the lungs, a distance of only a few
centimetres, it has a thinner muscular wall than the left ventricle. The left ventricle
has a thick muscular wall as it has to pump blood a long way.
There are two sets of valves to prevent backflow of blood;
The left atrioventricular (bicuspid) valves, formed of two cup-shaped flaps on the left
side of the heart.
The right atrioventricular (tricuspid) valves, formed of three cup-shaped flaps on the
right side of the heart.…read more

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Start: blood travels Atria contract Blood travels through
through vena cava bicuspid valve
Blood enters left
Blood enters right atrium Blood enters the left
atrium ventricle
Blood travels to
Atria contract alveoli in lung. O2 Ventricles contract
enters blood stream;
CO2 diffuses out
Blood travels through Blood travels through
tricuspid valve semilunar valves in
Blood travels through aorta
pulmonary vein
Blood enters the right
ventricle Finish: bloody travels
Blood travels through to body
semilunar valves in
Ventricles contract pulmonary artery…read more

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Atrial systole
SAN
AVN
Purkyne Ventricular
tissue systole…read more

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