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exercise science > Ch25 > Flashcards

Ch25 Flashcards

1
Q

pressure changes and valves control __ flow

A

blood

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2
Q

superior and inferior vena cava to RA to tricuspid valve to __ __

A

right ventricle

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3
Q

RV to __ ___to lungs for CO2/O2 exchange.

A

Pulmonary Valve

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4
Q

blood returns via pulmonary veins into ___ ___

A

left atrium

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5
Q

left atrium to aortic valve to aorta & coronary arteries then to the ___

A

body

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6
Q

the heart muscle

A

myocardium

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7
Q

supply oxygenated blood to the myocardium

A

coronary arteries

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8
Q

signficant obstruction of the coronary arteries reduces blood flow to the myocardium and decreases the ability of the heart to pump blood

A

Myocardial ischemia

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9
Q

Heart attack. Major or complete blockage leading to insufficient blood flow and death of part of the heart muscle

A

Myocardial Infarction

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10
Q

Even at rest, the heart muscle extracts ___% of the O2 delivered to it

A

75%

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11
Q

Heart’s natural pacemaker.

Initiates the heart beat. (60-100 bpm)

A

sinoatrial node (SA)

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12
Q

The bridge between the atria and the ventricles. Electrical signals are passed down from the atria to the ventricles through the AV node. 40-60 bpm

A

atrioventricular node (AV)

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13
Q

located top right atrium and spontaneously depolarize and intiate heart contractions

A

SA node

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14
Q

electrical: atrial depolarization
mechanical: atrial contraction

A

P wave

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15
Q

electrical: ventricular depolarization
mechanical: ventricular contraction

A

QRS wave

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16
Q

repolarization of heart : wave is

A

T wave

17
Q

beta blockers ____ heart rate

A

lower

18
Q

RV to Pulmonary Valve to lungs for CO2/O2 exchange.
• Blood returns via pulmonary veins into LA.
• LA to mitral valve into LV.
• LV to aortic valve to AORTA & coronary arteries then to the body.

A

heart chambers and valves

19
Q

At rest, the body extracts __% of the oxygen present in arterial blood

A

25%

20
Q

in the heart , 40% of the muscle cells are ___

A

mitochondria

21
Q

Represents the initiation of the impulse and movement through the AV node

A

PR interval

exercise science (7 decks)

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