CVS - Heart Wall & Coronary Circulation

Question 1

what are the layers of heart wall?

Answer 1

epicardium, myocardium & endocardium

Question 2

what is epicardium?

Answer 2

outermost layer of heart wall

Question 3

what is myocardium

Answer 3

concentric layers of cardiac muscle tissue

Question 4

what is endocardium?

Answer 4

a single layer of squamous cells, continuous w endothelial cells of attached BVs.

Question 5

how is blood supplied to the heart?

Answer 5

by coronary circulation, extensive network of BVs meet high O2 demands of cardiac muscles.

Question 6

where are the 2 coronary arteries location?

Answer 6

base of ascending aorta

Question 7

what are the branches & supplies of R coronary artery?

Answer 7

branches:
marginal branches
right posterior descending artery

supplies:
RA
interventricular septum
portion of ventricles
conducting system (SA, AV node)

Question 8

what are the main branches & supplies of L coronary artery?

Answer 8

main branch:
circumflex artery
left anterior descending(LAD) artery, aka. ant-interventricular artery

supplies:
LV, LA, interventricular septum

Question 9

what do capillaries within myocardium empty into?

Answer 9

venous drainages:
post cardiac vein
middle cardiac vein
great cardiac vein

Question 10

why do capillaries open into coronary sinus?

Answer 10

to drain into RA