heartbeat

Question 1

A heartbeat is

Answer 1

A single contraction of the heart

Question 2

The entire heart contracts in series

Answer 2

First the atria
* Then the ventricles

Question 3

Two Types of Cardiac Muscle Cells

Answer 3

1. Conducting cells
2. Contractile cells

Question 4

Conducting cells

Answer 4

Controls and coordinates heartbeat

Question 5

Contractile cells

Answer 5

Produce contractions that propel blood

Question 6

The Cardiac Cycle
* Begins with action potential at

Answer 6

SA node

Question 7

action potential is transmitted

Answer 7

through conducting system

Question 8

Produces action potentials in cardiac muscle cells

Answer 8

(contractile cells

Question 9

Electrocardiogram (ECG or EKG)

Answer 9

Electrical events in the cardiac cycle can be recorded
on an electrocardiogram

Question 10

The Conducting System is a system

Answer 10

of specilaized cardiac muscle cells

• It initiates and distributes electrical impulses that stimulate contraction

Question 11

The conducting system initiates and distributes

Answer 11

electrical impulses that
stimulate contraction

Question 12

Automaticity

Answer 12

Cardiac muscle tissue contracts automatically

Question 13

Where is the Sinoatrial (SA) node located

Answer 13

wall of right atrium

Question 14

Where is the Atrioventricular (AV) node located

Answer 14

• junction between atria and ventricles

Question 15

Conducting cells are found

Answer 15

throughout myocardium

Question 16

Conducting cells interconnect

Answer 16

SA and AV nodes

Question 17

Conducting cells distribute

Answer 17

stimulus through myocardium

Question 18

conducting cells in the atrium follow

Answer 18

• Internodal pathways

Question 19

The ventricles have these bundles and branches called

Answer 19

AV bundle and the bundle branches

Question 20

Prepotential is also called

Answer 20

pacemaker potential

Question 21

Resting potential of conducting cells Gradually depolarizes

Answer 21

toward threshold