right atrium

Question 1

atrioventricular orifice

Answer 1

blood flows from left atrium to left ventricle, tricuspid valve found here

Question 2

AV node

Answer 2

electrical relay station, in the posteroinferior region of the interatrial septum

Question 3

crista terminalis

Answer 3

origin of the pectinate muscles

Question 4

fossa ovalis

Answer 4

embryological remnant of the foramen ovale (whole between the atria)

Question 5

Opening of the coronary sinus

Answer 5

main cardiac vein, where deoxygenated blood is drained from the heart itself and into blood circulation

Question 6

pectinate muscles

Answer 6

parallel ridges in the wall of the atrium

Question 7

right auricle

Answer 7

muscular pouch, increases capacity of the atrium

Question 8

SA node

Answer 8

in the posterior wall of the right atrium, along the superior part of the crista terminalis, pacemaker of the heart

Question 9

Sulcus terminalis

Answer 9

point of fusion between the venous part of the right atrium and the true right atrium