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Fundamentals of EKG > Fundamentals of EKG > Flashcards

Fundamentals of EKG Flashcards

1
Q

Location of the heart

A

Lies in space between the lungs (mediastinum) in the middle of the chest. Behind sternum, above diaphragm. 2/3 of the heart lies to left of midline of sternum.

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2
Q

Walls of the heart

A
  1. Endocardium
  2. Myocardium
  3. Epicardium
  4. Pericardium
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3
Q

Endocardium

A
  • Innermost layer of the heart.
  • Lines hearts inner chambers
  • Contains terminal components of hearts specialized conduction system
  • Continuous with the innermost layer of arteries, veins, and capillaries of the body-> creates a closed continuous circulatory system.
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4
Q

Myocardium

A
  • Middle and thickest layer of heart.
  • Muscular component
  • Responsible for hearts pumping action.
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5
Q

Epicardium

A

External layer of the heart.

Contains: arteries, blood capillaries, lymph cap, nerve fibers, and fat.

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6
Q

Pericardium

A

Double walled sac that encloses/protects the heart.

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7
Q

Purpose: Atria

A

Receive blood.

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8
Q

Purpose: Ventricles

A

Pump blood.

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9
Q

Heart chambers

A

(4): RA, RV, LA, LV

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10
Q

Left cicumflex artery

A

Block here means the whole posterior heart wont get blood flow.

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11
Q

Blood flow through the heart: Cardiac Cycle

A

The interval from the beginning of one heart beat to the beginning of the next one. It represents a sequence of atrial contraction and relaxation followed by ventricular contraction and relaxation.

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12
Q

Diastole

A

The period of atrial or ventricular relaxation

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13
Q

Systole

A

The period of atrial or ventricular contraction

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14
Q

Four intrinsic properties of cardiac muscle

A
  1. Automaticity
  2. Excitability
  3. Conductivity
  4. Contractility
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15
Q

Automaticity

A

The ability of the cell to spontaneously generate and discharge an electrical impulse

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16
Q

Excitability

A

The ability of the cell to respond to an electrical impulse

17
Q

Conductivity

A

The ability of the cell to transmit an electrical impulse from one cell to another.

18
Q

Contractility

A

Contract when they are depolarized by an electrical impulse.

Fundamentals of EKG (2 decks)

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