heart action Flashcards

1
Q

heart pumps blood when…

A

its muscles contract

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2
Q

contraction… (3)

A

squeezes blood out of chamber

semi-lunar valves open

atrioventricular valves closed to prevent blood from flowing back to atria

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3
Q

relaxation (3)

A

atria fill up with blood from veins

semi-lunar valves closed

atrioventricular valves open due to pressure of blood from atria

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4
Q

atria ____ and ______ at the same time

A

contract, relax

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5
Q

ventricles _____ and ______ at the same time

A

contract, relax

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6
Q

contraction 2 phases

A
  1. atria contract and force blood into the ventricles

2. the ventricles contract and force blood out of the arteries

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7
Q

cardiac cycle

A

the changes that occur during one heart beat

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