Cardio Physiology Flashcards

(35 cards)

1
Q

P-Wave

A

depolarization of SA node in atria

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2
Q

P-R Interval

A

beginning of atrial excitation to beginning of ventricular excitation

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3
Q

QRS Wave

A

ventricular depolarization and atrial repolarization

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4
Q

T-Wave

A

ventricular repolarization

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5
Q

S-T Segment

A

entire ventricular myocardium depolarized

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6
Q

Q-T Interval

A

beginning of ventricular depolarization through ventricular repolarization

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7
Q

Systole

A

heart contraction (depolarization)

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8
Q

Diastole

A

heart relaxation (repolarization)

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9
Q

Cardiac Cycle

A

blood flow through heart during one complete heartbeat

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10
Q

Ventricular Filling

A

Pressure = low.

Blood passively flows in, then atria depolarize to release the rest of the blood to ventricles

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11
Q

Atrial Contraction

A

Atria depolarize after sensing from AV node

P-Wave

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12
Q

End Diastolic Volume

A

volume of blood in each ventricle at end of ventricular diastole

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13
Q

Isovolumetric Contraction

A

All valves are closed

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14
Q

End Systolic Volume

A

volume of blood remaining in each ventricle after systole (contraction)

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15
Q

Isovolumetric Relaxation

A

Occur after T-Wave (ventricular repolarization) so ventricles are relaxed

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16
Q

SA Node

A

Pacemaker of heart in right atria-generates impulses. Decreases heart rate to 75. Without SA node, heart rate = 100

17
Q

AV Node

A

delays impulses. at the bottom of right atria . If damaged = heart block

18
Q

Bundle of His

A

electrical connection b/w atria and ventricles

19
Q

Bundle Branches

A

Carry electrical signal through intravenetricular septum

20
Q

Cardiac Output (CO)

A

Volume of blood pumped by each ventricle in 1 minute

CO (5.25) = HR (75) x SV (70 mL)

21
Q

Stroke Volume (SV)

A

volume of blood pumped out by one ventricle with each beat.

Affected by preload, contractility, and afterload

22
Q

Heart Rate (HR)

A

number of beats per minute

23
Q

Preload

A

degree which cardiac muscle cells are stretched just before they contract.
Venous Return = important (amt of blood returning to heart)

24
Q

Contractility

A

Contractile strength at given muscle length
Increased contractility lowers ESV
Decreased contractility by acidosis

25
What component of the body is dominant in heart rate?
Parasympathetic nervous system. Specifically the vagal nerve.
26
Tachycardia
>100 bmp (fast heart rate)
27
Bradycardia
<60 bpm (slow heart rate)
28
Blood Pressure
measured by contraction of ventricles. | determined by CO, blood volume, and vascular resistance
29
sphygmomanometer
used to measure blood pressure
30
Pulse
feeling of the arteries dialation
31
Pulse points
Temporal artery, cartoid, apical pulse, brachail pulse, radial, femoral, popliteal artery, posterior tibial artery, and pedal
32
Pulse Pressure
avg: 120/80 (normal) systolic/diastolic
33
Mean Arterial Pressure (MAP)
MAP= (systolic +2(diastolic))/3 Average pressure in arteries for one cardiac cycle.
34
Total Peripheral Resistance
TPR= MAP/CO Resistance in blood flow
35
atherosclerosis
build up of fat in artery walls. (leads to heart attack/cardiac arrest)