Circulatory/cardiovascular System

Question 1

What are the 3 layers of the heart (+sac) ?

Answer 1

Endocardium (inner), myocardium (muscular), and epicardium (outer).
The sac is called pericardium.

Question 2

Function of the left pump (heart):

Answer 2

Receives oxygenated blood from lungs to send to the body. (Strongest pump)

Question 3

Function of the right pump (heart):

Answer 3

Receives deoxygenated blood from body and sends it to the lungs to drop off co2 and pick up o2 before going to the left heart.

Question 4

Septal wall:

Answer 4

Divides the heart into left and right

Question 5

Atria

Answer 5

Two upper chambers of the heart where blood returns and pumps blood into the ventricles

Question 6

Ventricles

Answer 6

Lower chambers which send out blood to lungs (right/deoxygenated) or body (left/oxygenated)

Question 7

SA node & how many impulses?

Answer 7

Sinoatrial node which generates electrical impulses between 60-100/minute.

Question 8

AV node

Answer 8

Backup for SA generates 40-60/min

Question 9

Bundle of His

Answer 9

20-40/min