Cardiac Cycle And Pressure Change Flashcards

1
Q

What is the repeating sequence of the heart pumping blood through the body called?

A

cardiac cycle

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2
Q

Summarise happens during the cardiac cycle?

A

the filling and emptying of blood by electrical signals causing the heart to contract and relax

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3
Q

What is the phase of the heart contracting to push blood out to pump thru body, in the cardiac cycle called?

A

Systole

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4
Q

What is the relaxation phase where the heart fills with blood in the cardiac cycle called?

A

Diastole

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5
Q

Describe what happens during the cardiac cycle?
(lub - dub)

A
  • atria contract at the same time
  • forcing blood thru AV valves into ventricles
  • closing of the AV valves produces a lub sound
  • after a delay, the ventricles contract at the same time
  • forcing blood through the semilunar valves into the aorta and pa (transporting blood to lungs)
  • closing of the semilunar valves produces a dub sound
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6
Q

Why is there a change in pressure in the heart chambers during the cardiac cycle?

A

result of the changes in volume of blood within the chambers and the contractions of heart muscle

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7
Q

What are the 4 stages of the cardiac cycle in terms of pressure change?

A
  • blood enters atrium
  • blood enters ventricle
  • ventricle muscles contract
  • ventricle muscles relax
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8
Q

What happens to pressure during the first stage of BLOOD ENTERING ATRIUM during cardiac cycle ?

A
  • blood enters atrium
  • blood volume increases pressure in atrium
  • pressure in atrium greater than in ventricle
  • AV valve opens
  • atrium muscles contract
  • increases pressure more
  • remaining blood forced into ventricle from atrium
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9
Q

What happens to pressure during the second stage of BLOOD ENTERING VENTRICLE during cardiac cycle ?

A
  • increases pressure in ventricle due to volume of blood
  • pressure in ventricle greater than in atrium
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10
Q

What happens to pressure during the third
stage of VENTRICLE MUSCLES CONTRACTING during cardiac cycle ?

A
  • ventricle muscles contract
  • increases pressure more in ventricle until greater than in aorta
  • semi lunar valve opens
  • blood enters aorta
  • blood is pumped to body or lungs
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11
Q

What happens to pressure during the fourth
stage of VENTRICLE MUSCLES RELAXING during cardiac cycle ?

A
  • ventricle muscles relax
  • pressure in ventricle is less than in aorta
  • semi lunar valves close
  • blood enters atrium
  • blood volume increases pressure in atrium

(then back to 1st stage)

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12
Q

What is the order of the valves opening and closing?

A
  • AV valves close C
  • SL valves open O
  • SL valves close C
  • AV valves open O
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13
Q

Describe the pressure when AV valves close

A

pressure in ventricle is higher than atria

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14
Q

Describe the pressure when SL open

A

pressure in ventricle is higher than aorta

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15
Q

Describe the pressure when SL valves close

A

pressure in ventricle is less than aorta

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16
Q

Describe the pressure when AV valves open

A

pressure in atrium is higher than ventricles