Electro conduction of the Heart

Question 1

Electrocardiogram (ECG or EKG)

Answer 1

uses electrodes to record events in the cardiac cycle
Large action potentials in the heart cause electrical current to flow outward to all part of the body
electrodes register the voltage difference at different times

Question 2

QRS complex

Answer 2

Ventricle depolarization

Question 3

Sinoatrial node SA

Answer 3

collection of specialized cells.
resting membrane potential less negative and unstable so that cells gradually reach threshold.
ion channels in pacemaker cells are different from other cardiac cells

Question 4

P wave

Answer 4

Represents atrial depolarization

Question 5

T-wave

Answer 5

full ventricular repolarization

Question 6

U wave

Answer 6

further repolarization of the ventricles if present

Question 7

AV Node

Answer 7

creates a slow delay

Question 8

Valves: upper right

Answer 8

aortic valve

Question 9

Valves: upper left

Answer 9

Pulmonary valves

Question 10

Valves: lower right

Answer 10

triscupid valve

Question 11

Valves: lower left

Answer 11

Mitrial Valve