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[06] Cardiovascular System > [06] Cardiac Cycle > Flashcards

[06] Cardiac Cycle Flashcards

1
Q

What are the main phases of the cardiac cycle?

A
  • Diastole
  • Systole
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2
Q

What is diastole?

A

Relaxation phase where the heart fills with blood

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3
Q

What is systole?

A

Contraction phase where the heart pumps blood out

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4
Q

What happens during the atrial systole?

A

Atria contract and blood is pushed into the ventricles

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5
Q

What happens during the ventricular systole?

A

Ventricles contract and blood is pumped out of the heart

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6
Q

What happens during the atrial diastole?

A

Atria relax and fill with blood returning to the heart

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7
Q

What happens during the ventricular diastole?

A

Ventricles relax and fill with blood passed down from the atria

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8
Q

What is the period called between the start of one heartbeat and the start of the next?

A

Cardiac cycle

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9
Q

What is the normal heart rate for adults at rest?

A

60 to 100 beats per minute

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10
Q

What controls the heart rate?

A

Autonomic nervous system

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11
Q

What part of the brain controls the autonomic nervous system?

A

Medulla oblongata

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12
Q

What hormone can increase the heart rate?

A

Adrenaline

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13
Q

What part of the autonomic nervous system increases heart rate?

A

Sympathetic nervous system

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14
Q

What part of the autonomic nervous system decreases heart rate?

A

Parasympathetic nervous system

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15
Q

What is the sequence of electrical conduction in the heart?

A
  • Sinoatrial node (SA node)
  • Atrioventricular node (AV node)
  • Bundle of His
  • Right and left bundle branches
  • Purkinje fibers
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16
Q

What is the function of the SA node?

A

It initiates each heartbeat and sets the pace for the heart rate (natural pacemaker)

17
Q

What is the function of the AV node?

A

It delays the signal before it is passed to the ventricles

18
Q

What is the function of the Bundle of His, bundle branches, and Purkinje fibers?

A

They rapidly conduct the signal to the ventricles causing them to contract

19
Q

How long does the cardiac cycle typically last?

A

Approximately 0.8 seconds

[06] Cardiovascular System (7 decks)

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