normal heart

Question 1

coronary arteries

Answer 1

right and left
originate at the coronary sinus, higher pressure because of elastic rebound force that pushes blood through the arteries between contractions

Question 2

cardiac veins

Answer 2

great, middle, small, empties into coronary sinus to the RA

Question 3

location of SA node

Answer 3

wall of right atruim

Question 4

atrioventricular node

Answer 4

junction between atria and ventricles

Question 5

conduction pathway in the atriums

Answer 5

internodal pathways

Question 6

conduction pathways in the ventricles

Answer 6

AV bundle and the bundle branches

Question 7

SA node

Answer 7

posterior wall od RA
pacemaker cells
connected to AV node by internodal pathways
atrial contraction begins at SA node

Question 8

AV node

Answer 8

in floor of RA
impulse arrives from AS node
delays the impulse, atrias contract

Question 9

the AV bundle

Answer 9

in the septum

carries the impulses to left and right bundle branches- whiche connect to the purkinje fibers and to the moderator band

Question 10

purkinje fibers

Answer 10

distribute impulse through the ventricles
atrial contraction is completed
ventricular contraction begins

Question 11

ectopic pace makers

Answer 11

abnormal cells
high rate of action potential
bypass the conduction system
disrupts ventricular contractions