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ex phys > Exam 2 Ch 13 > Flashcards

Exam 2 Ch 13 Flashcards

1
Q

SA node

A

pacemaker

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2
Q

AV node

A

delays ventricular signal

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3
Q

Spontaneous rhythmicity

A

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

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4
Q

How does electrical signal spread

A

via gap junctions

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5
Q

Initiates contraction signal

A

SA node

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6
Q

How does the signal spread from SA node to AV node

A

Via RA/La

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7
Q

Delays, relays signal to venticles

A

AV node

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8
Q

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

A

Vagus nerve
cranial nerve X

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9
Q

What is intrinsic HR

A

100 beats per minute

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10
Q

What is normal resting heart rate

A

60-100 bpm

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11
Q

What do elite endurance athletes usually have for heart rate

A

30 bpm

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12
Q

sympathetic

A

fight or flight

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13
Q

parasympathetic

A

rest and digest

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14
Q

ECG (electrocardiogram)

A

recording of hearts electrical activity

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15
Q

P wave

A

atrial depolarization

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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
Q

Systole

A

Contraction phase

26
Q

Ventricular systole

A

1/3 of cardiac cycle
Contraction begins

27
Q

end systolic volume

A

blood left in ventricle after contraction

28
Q

Ventricular diastole

A

2/3 of cardiac cycle
Relaxation begins

29
Q

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

A

70% passively
30% by atrial contraction

30
Q

End diastolic volume (EDV)

A

at end of ventricular diastole, blood in ventricle

31
Q

How long does diastole and systole last during rest

A

Diastole - 0.5 sec
Systole - 0.3 sec

32
Q

How long does diastole and systole last during exercise

A

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

ex phys (19 decks)

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