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interatrial septum

separates the atria

interventricular septum

divide the ventricles

what is contained in the openings between the atria and ventricles?

folds of connective tissue covered by endocardium, these valves maintain a one-way flow of blood

superior and inferior vena cava

two great veins in the systemic circuit through which the right atrium receives blood

pectinate muscles

prominent muscle ridges in the atrial walls

coronary veins

return blood to the coronary sinus

foramen ovale

an opening that is formed during embryonic development and penetrates the interatrial septum

fossa ovalis

depression that is left after the foramen ovale closes after birth

where does blood leaving the right atrium flow?

into the right ventricle through the atrioventricular (AV) valve

contents of atrioventricular valve

three cusps of fibrous tissue braced by the tendinous chordae tendineae that are connected to papillary muscles

blood leaving right ventricle flows where?

into the pulmonary valve then enters the pulmonary trunk

divisions of pulmonary trunk form?

left and right pulmonary arteries

what supplies left atrium with oxygenated blood?

left and right pulmonary veins

where does blood leaving left atrium flow?

into the left ventricle through the left atrioventricular (AV) valve

another name for left atrioventricular valve

mitral or bicuspid valve

what is the largest and thickest of the four chambers? and why?

the left ventricle because it must pump blood to the entire body

what is the path of blood leaving the left ventricle?

passes through the aortic valve into the systemic circuit via the ascending aorta, through the aortic arch and into the descending aorta

what does the coronary sinus open into?

right atrium

what is another name for the right atrioventricular (AV) valve?

tricuspid valve

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