Chambers of the Heart Flashcards
What does the right atrium do during diastole?
Pumps deoxygenated blood through the tricuspid valve into the right ventricle.
What does the right atrium do during systole?
Receives deoxygenated venous blood from the systemic circulation via SVC and IVC, and the coronary circulation via the coronary sinus.
What is the foramen ovale and why is it necessary to a fetus?
It is an opening between the two atria, due to the fact that fetuses don’t have functioning lungs, so the blood does not need to circulate to the right ventricle.
What is the fossa ovalis?
The remnant of the foramen ovale in the right atrium of adults.
What is the the right auricle?
It’s a remnant of the fetal right atrium.
What is the pectinate muscle?
Tissue that lines the right atrium.
What does the right ventricle do during diastole?
Receives deoxygenated blood from the right atrium via the tricuspid valve.
What does the right ventricle do during systole?
Pumps deoxygenated blood through the pulmonary valve into the pulmonary trunk en route to the lungs.
Protecting ridges of myocardium on the internal surface of the right ventricle.
Trabeculae carneae.
Elevations of myocardium that attach to the cusps of the tricuspid valve via fibrous chords called chordae tendineae.
Papillary muscles.
A ridge of myocardium coursing between anterior and septal papillary muscles and the right ventricle wall.
Moderator band.
What does the left atrium do during diastole?
Pumps oxygenated blood through the bicuspid valve into the left ventricle.
What does the left atrium do during systole?
Receives oxygenated blood from the lungs via the pulmonary veins.
Paired veins on the left and right deliver oxygenated blood from the lungs to the left atrium.
Pulmonary veins.
What does the left ventricle do during diastole?
Receives oxygenated blood from the left atrium via the bicuspid valve.
