Exam 2 Ch 13 Flashcards

1
Q

SA node

A

pacemaker

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

AV node

A

delays ventricular signal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Spontaneous rhythmicity

A

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

How does electrical signal spread

A

via gap junctions

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Initiates contraction signal

A

SA node

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

How does the signal spread from SA node to AV node

A

Via RA/La

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Delays, relays signal to venticles

A

AV node

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

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

A

Vagus nerve
cranial nerve X

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What is intrinsic HR

A

100 beats per minute

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What is normal resting heart rate

A

60-100 bpm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What do elite endurance athletes usually have for heart rate

A

30 bpm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

sympathetic

A

fight or flight

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

parasympathetic

A

rest and digest

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

ECG (electrocardiogram)

A

recording of hearts electrical activity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

P wave

A

atrial depolarization

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

QRS complex

A

ventricular depolarization

17
Q

T wave

A

ventricular repolarization

18
Q

Bradycardia

A

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

19
Q

tachycardia

A

abnormally high resting heart rate (with no exercise)

20
Q

Graded exercise test to evaluate cardiac function

A

observe ECG during exercise
Also observe changes in blood pressure

21
Q

Fatty plaque that narrows coronary arteries
Reduces blood flor to myocardium

A

Atherosclerosis

22
Q

Myocardial ischemia

A

tissue death

23
Q

All mechanical electrical events occurring during one hearbeat

A

Cardiac Cycle

24
Q

Diastole

A

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

25
Systole
Contraction phase
26
Ventricular systole
1/3 of cardiac cycle Contraction begins
27
end systolic volume
blood left in ventricle after contraction
28
Ventricular diastole
2/3 of cardiac cycle Relaxation begins
29
How much fills passively and how much fills by atrial contraction in ventricular diastole
70% passively 30% by atrial contraction
30
End diastolic volume (EDV)
at end of ventricular diastole, blood in ventricle
31
How long does diastole and systole last during rest
Diastole - 0.5 sec Systole - 0.3 sec
32
How long does diastole and systole last during exercise
diastole - 0.13 sec systole - 0.2 sec (systole doesnt change too much)