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Anatomy And Physiology 2 Lecture > Chapter 19 Vocab > Flashcards

Chapter 19 Vocab Flashcards

1
Q

Pericardium

A

A double-walled sac around the heart composed of: parietal layer of serous pericardium and visceral layer of serous pericardium

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2
Q

Endocardium

A

Endothelial layer of the inner myocardial surface

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3
Q

Epicardium

A

Visceral layer of the serous pericardium

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4
Q

Myocardium

A

Cardiac muscle layer forming the bulk of the heart

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5
Q

Intercalated discs

A

Link cardiac muscle cells together mechanically and electrically

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6
Q

Desmosomes

A

Protein filaments that physically connect adjacent cardiac muscle cells

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7
Q

Gap junctions

A

Protein channels that allow ions to flow between adjacent cells

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8
Q

Coronary vessels

A

Blood supply of the heart wall

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9
Q

Coronary arteries bring

A

Oxygenated blood to myocardium

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10
Q

Coronary veins collect

A

Deoxygenated blood and drain it into the coronary sinue

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11
Q

Systole

A

Contraction of a heart chamber

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12
Q

Diastole

A

Relaxation of the heart chamber

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13
Q

S1

A

First sound occurs as AV valves close

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14
Q

S2

A

Second sound occurs when semilunar valves close

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15
Q

Tissue perfusion

A

The flow of blood through arteries and capillaries delivering nutrients and oxygen to cells and removing cellular waste products

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16
Q

Cardiac output

A

Amount of blood pumped by a single ventricle in one minute

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17
Q

Chronotropic agents

A

Factors that influence heart rate

18
Q

Positive chronotropic

A

Increase the heart rate

19
Q

Negative chronotropic agents

A

Decrease the heart rate

20
Q

Bradycardia

A

Persistently low resting heart rate in adults

21
Q

Tachycardia

A

Persistently high resting heart rate

22
Q

Stroke volume

A

Volume of blood ejected during one beat

23
Q

Contractility

A

Force of contraction

24
Q

Inotropic agents

A

Factors that affect contractility

25
Q

Electrocardiography

A

Is a science of recording and interpreting the electrical activity that precedes and is a measure of the action of heart muscles

26
Q

Electrocardiograph

A

Is a instrument for recording the changes of electrical potential occurring during the heart beat used especially in diagnosing abnormalities of heart action

27
Q

Electrocardiogram

A

(EKG or ECG) is a graphical record (on paper or screen) of the electrical waves of the heart, as registered on the electrocardiograph

28
Q

ECG (electrocardiogram)

A

Records the electrical activity of the heart, providing a record of cardiac electrical activity, as well as valuable information about the heart’s function and structure.

29
Q

Spontaneous depolarization

A

Cell membranes are naturally leaky to sodium and calcium ions

30
Q

SA Node

A

Dominant pacemaker with an intrinsic rate of 60-100 bpm

31
Q

AV Node

A

Back-up pacemaker with an intrinsic rate of 40-60 bpm

32
Q

Ventricular cells

A

Back-up pacemaker with an intrinsic rate of 20-45 bpm

33
Q

Automaticity

A

Cardiac muscle tissue contracts on its own, in the absence of neural of hormonal stimulation.

34
Q

Depolarization

A

Movement of sodium across cell membrane causing inside of the cell to become more positive resulting in contraction

35
Q

Repolarization

A

Movement of potassium across cell membranes in which the inside of cell is restored to its negative charge

36
Q

P wave

A

Atrial depolarization

37
Q

QRS

A

Ventricular depolarization

38
Q

T waves

A

Ventricular repolarization

39
Q

Bradycardia

A

Abnormally slow heart rate below 60 per min.

40
Q

Tachycardia

A

Abnormally fast heart rate above 100 per min.

Anatomy And Physiology 2 Lecture (37 decks)

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