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2AP > Function of Heart > Flashcards

Function of Heart Flashcards

1
Q

Myocardium

A

Heart Muscle

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2
Q

Systole

A

Contraction

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3
Q

Diastole

A

Relaxation

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4
Q

Cardiac cycle

A

Atrial systole > Ventricular Systole > Diastole

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5
Q

Atrial Systole

A

Atria contract, pump blood to ventricles; AV valves open, ventricles relaxed

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6
Q

Ventricular Systole

A

Ventricles contract, AV valves closed, blood opens semi-lunar valves, blood-> pulmonary artery & aorta

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7
Q

Diastole

A

Atria and ventricles in diastole, blood -> atria, AV valves open, blood -> ventricles (period of filling atrium from body)

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8
Q

Sympathetic Stimulation (fight/flight)

A

SA node activity^; heart rate^ (chronatropic)

AV node conduction^; force of myocardium contraction^ (inotropic)

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9
Q

Chronatropic

A

heart rate^

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10
Q

Parasympathetic stimulation (feed/breed)

A

SA node activity v, heart rate v (chronotropic) ; AV node conduction v, no effect on strength of contraction

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11
Q

Sympatholytic =

A

Parasympathomimetic

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12
Q

Cardiac output

A

rate x stroke volume

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13
Q

1 min = ___L of blood

A

5L

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14
Q

heart can pump - x more blood when demand is higher

A

4-5x more

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15
Q

bigger size of person = ___ heart rate

A

slower

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16
Q

gender (M) = ____ heart rate

A

slower

17
Q

age^ = ____ heart rate

A

slower

18
Q

Starlings law of the heart

A

greater the stretch = stronger force of contraction

19
Q

Inotropic effect

A

force of contraction^ without stretching

20
Q

Left forward heart failure

A

less blood to body -> cyanosis

21
Q

Left backward heart failure

A

blood backs up in lungs = pulmonary edema (fluid in lungs)

22
Q

Right forward failure

A

can’t pump to lungs

23
Q

Right backward failure

A

back up in body/systemic circulation (juggular vein distention); blood accumulates from liver, spleen, digestion; pitting edema ->)

24
Q

Emphysema

A

hard for blood to be pumped into lungs;damage to air sacs in lungs; short breath

25
Q

Myocardial infarcts

A

effects ability to pump= heart failure later

26
Q

Chronotropic

A

V heart rate

2AP (25 decks)

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