Electrical and Contractile Activity of the Heart Vocabulary

Question 1

contaction =

Answer 1

systole

Question 2

dilation=

Answer 2

diastole

Question 3

systole and diastole usually refer to actions occurring in the _______

Answer 3

ventricles

Question 4

normal heartbeat triggered by the SA node

-adult at rest is typically 70 to 80 bpm

Answer 4

Sinus rhythm

Question 5

Three phases to ventricular cardiocyte action potential:

Answer 5

1. Depolarization
2. Plateau
3. Repolarization

Question 6

Recording of all electrical activity of the heart

Answer 6

ECG or EKG

Question 7

SA node fires, atria depolarize and contract; finally relax

Answer 7

P wave

Question 8

The time from the end of the P wave to the start of the QRS complex. It reflects conduction through the AV node

Answer 8

PR interval

Question 9

Ventricular depolarization, Complex shape of spike due to different thickness and shape of the two ventricles

Answer 9

QRS complex

Question 10

Ventricular systole, Corresponds to plateau in myocardial action potential

Answer 10

ST Segment

Question 11

Ventricular repolarization and relaxation

Answer 11

T Wave

Question 12

listening to sounds made by body

Answer 12

Auscultation

Question 13

amount ejected by each ventricle in 1 minute

Answer 13

Cardiac output (CO)

Question 14

volume of blood ejected from heart during one cardiac cycle

Answer 14

Stroke volume

Question 15

the difference between a person’s maximum and resting CO (Increases with fitness, decreases with disease)

Answer 15

Cardiac reserve

Question 16

when areas of the heart are depolarizing they are ________

Answer 16

contracting

Question 17

when areas of the heart are repolarizing they are ________

Answer 17

relaxing

Question 18

“lubb” sound is the closure of the ______ valves?

Answer 18

AV valves

Question 19

“dubb” sound in the closure of the __________ valves?

Answer 19

semilunar

Question 20

what equation is used to determine cardiac output?

Answer 20

heart rate x stroke volume

Question 21

Why does SV increase during exercise?

Answer 21

To fuel tissues throughout the body