Exam 2 Ch 13

Question 1

SA node

Answer 1

pacemaker

Question 2

AV node

Answer 2

delays ventricular signal

Question 3

Spontaneous rhythmicity

Answer 3

special heart cells generate and spread electrical signal
SA node
AV node
AV bundle
Purkinje fibers

Question 4

How does electrical signal spread

Answer 4

via gap junctions

Question 5

Initiates contraction signal

Answer 5

SA node

Question 6

How does the signal spread from SA node to AV node

Answer 6

Via RA/La

Question 7

Delays, relays signal to venticles

Answer 7

AV node

Question 8

how is extrinsic control of the heart with parasympathetic nervous system get to the heart

Answer 8

Vagus nerve
cranial nerve X

Question 9

What is intrinsic HR

Answer 9

100 beats per minute

Question 10

What is normal resting heart rate

Answer 10

60-100 bpm

Question 11

What do elite endurance athletes usually have for heart rate

Answer 11

30 bpm

Question 12

sympathetic

Answer 12

fight or flight

Question 13

parasympathetic

Answer 13

rest and digest

Question 14

ECG (electrocardiogram)

Answer 14

recording of hearts electrical activity

Question 15

P wave

Answer 15

atrial depolarization

Question 16

QRS complex

Answer 16

ventricular depolarization

Question 17

T wave

Answer 17

ventricular repolarization

Question 18

Bradycardia

Answer 18

abnormaly low resting heart rate (usually below 60 bpm w/ no exercise)

Question 19

tachycardia

Answer 19

abnormally high resting heart rate (with no exercise)

Question 20

Graded exercise test to evaluate cardiac function

Answer 20

observe ECG during exercise
Also observe changes in blood pressure

Question 21

Fatty plaque that narrows coronary arteries
Reduces blood flor to myocardium

Answer 21

Atherosclerosis

Question 22

Myocardial ischemia

Answer 22

tissue death

Question 23

All mechanical electrical events occurring during one hearbeat

Answer 23

Cardiac Cycle

Question 24

Diastole

Answer 24

relaxation phase
chambers fill with blood
Lasts twice as long as systole

Question 25

Systole

Answer 25

Contraction phase

Question 26

Ventricular systole

Answer 26

1/3 of cardiac cycle
Contraction begins

Question 27

end systolic volume

Answer 27

blood left in ventricle after contraction

Question 28

Ventricular diastole

Answer 28

2/3 of cardiac cycle
Relaxation begins

Question 29

How much fills passively and how much fills by atrial contraction in ventricular diastole

Answer 29

70% passively
30% by atrial contraction

Question 30

End diastolic volume (EDV)

Answer 30

at end of ventricular diastole, blood in ventricle

Question 31

How long does diastole and systole last during rest

Answer 31

Diastole - 0.5 sec
Systole - 0.3 sec

Question 32

How long does diastole and systole last during exercise

Answer 32

diastole - 0.13 sec
systole - 0.2 sec
(systole doesnt change too much)