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Physiology > Cardiovascular system > Flashcards

Cardiovascular system Flashcards

1
Q

The nodal system in the heart….

A
  • Generates its own electricity
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2
Q

SA node (sinoatrial node)

A
  • Special type of nervous tissue
  • Pace maker
  • Generates impulses
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3
Q

Atrioventricular Node

A
  • AV bundle connects the atria to the ventricles.
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4
Q

Sequence of electrical excitation in the heart

A
  1. Sinoatrial node generates the impulses
  2. The impulses pause (0.1s) at the Atrioventricular node
  3. The atrioventricular bundle connects the atria to the ventricles
  4. The bundle branches conduct impulses throught the interventricular septum
  5. The subendocardial conducting networkdepolarizes the contractile cells of both ventricles
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5
Q

SA node

A
  • Sinoatrial node
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6
Q

AV node

A

Atrioventricular node

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7
Q

The nodal system in the heart generates its own ________.

A

electricity

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8
Q

The SA node is the _________ of the heart.

A

Pacemaker

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9
Q

The AV node is connected to the __________.

A
  • Bundle branches
  • Bundle brances contain conducter cells that carry out electrical signal through out the heart
  • bundle branches are located in the interventricular septum
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10
Q

Arrhythmias

A
  • Heart rythm abnormalities
  • means without rythm
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11
Q

Cardiac Output

A

The volume of blood pumped per minute by each ventricle of the heart. Cardiac output is equal to the stroke volume (the amount of blood pumped from a ventricle in a single heartbeat) times the heart rate.

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12
Q

Stroke volume

A

Stroke volume (SV) is the amount of blood pumped out of the heart (left ventricle - to the body) during each contraction measured in mL/beat (millilitres per beat).

  • Volume of blood pumped out by one ventricle with each beat
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13
Q

What is the equation for cardiac output?

A

CO= Heart Rate x Stroke Volume

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14
Q

What is Heart rate?

A

the # of beats per minute

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15
Q

What is normal cardiac output?

A

5.25 L/min

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16
Q

The P wave shows

A

Atrial depolarization initiated by SA node

17
Q

The QRS complex shows

A

Ventricular depolarization

18
Q

The T wave shows

A

Ventricular repolarization

19
Q

Flat line between P wave and QRS complex shows

A

The delay of the electrical impulse between the SA node and the AV node

20
Q

QRS Complex shows

A

Ventricular depolarization begins at apex of the heart, Atria repolarize

21
Q

Flat line between QRS complex and T wave shows

A

ventricular depolarization is complete

22
Q

T wave shows

A

Ventricular repolarization begins at apex causing T wave

23
Q

Flat line after T wave shows

A

ventricular repolarization is complete

Physiology (15 decks)

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