Deck 3: Heart Electrical Physiology

Question 1

A normal healthy pulse pressure should be in the range of ___________.

A) 60 mm Hg
B) 55 mm Hg
C) 20 mm Hg
D) 40 mm Hg

Answer 1

40 mm Hg

Question 2

In normally functioning hearts, what percentage of the blood leaving the atria is dumped freely into the ventricles?

A) 70-85%
B) 20-30%
C) 40%
D) 10%

Answer 2

70-85%

Question 3

Increased heart rate occurs when the sympathetic nerve fibers release ___________.

A) ADH
B) epinephrine
C) aldosterone
D) acetylcholine

Answer 3

epinephrine

Question 4

What are positive ions called?

A) Electrolytes
B) Cations
C) Impulses
D) Anions

Question 5

What is the purpose of the bundle of His?

A) To transmit nerve impulses
B) To slow the impulse as the depolarization spreads throughout the atria
C) To act as a passage way between the upper and lower chambers of the heart
D) To mediate the heart's pacemaker function

Question 6

What reflects the highest resistance or maximum pressure when the heart contracts?

A) Systolic blood pressure
B) Polarization
C) Pulse pressure
D) Diastolic blood pressure

Question 7

Repolarization is synonymous with ___________.

A) recovery
B) resting and recovery
C) resting
D) action potential

Question 8

Which of the following is a subdivision of the anterior nodal pathway and is the electrical impulse that travels to the left atrium?

A) Bundle of His
B) Thorel's Pathway
C) Wenchebach's Bundle
D) Bachmann's Bundle

Question 9

What is measured by multiplying the heart rate by the stroke volume?

A) Arterial resistance
B) Blood volume
C) Cardiac output
D) Preload

Question 10

Which of the following is often referred to as the "rhythmic" cardiac cell function because the myocardial cells produce a heartbeat in response to electrical stimulus created by the pacemaker cardiac cells?

A) Contractibility
B) Automaticity
C) Excitability
D) Conductivity

Question 11

In the cardiac cells' resting state, the electrolytes within the cell carry what type of charge?

A) Positive
B) Neutral
C) Free
D) Negative

Question 12

Which of the following is referred to as irritability of the cardiac cells because the cells are responding to stimulus?

A) Contractility
B) Excitability
C) Automaticity
D) Conductivity

Question 13

Which of the following is classified as a dietary inorganic macro-mineral which is essential for animal life?

A) Sodium
B) Calcium
C) Magnesium
D) Potassium

Question 14

What is the drug of choice for controlling ventricular tachycardia?

A) Potassium
B) Diuretics
C) Heparin
D) Magnesium

Question 15

What is the contraction phase in the heartbeat called?

A) Diastole
B) Cardiac output
C) Systole
D) Stroke volume

Question 16

Which of the following is required by the body to build proteins and muscles?

A) Magnesium
B) Calcium
C) Potassium
D) Sodium

Question 17

____________     is the pacemaker cardiac cells ability to spontaneously generate an electrical impulse without outside stimulation or stimulation by the nervous system.

A) Contractility
B) Automaticity
C) Conductivity
D) Excitability

Question 18

What would cause reduced plasma osmolality and excessive urination?

A) Hyponatremia
B) Hypokalemia
C) Hyperkalemia
D) Hypernatremia

Question 19

Which of the following is considered the heart's primary pacemaker?

A) Atrioventricular (AV) node
B) Sinoatrial (SA) node
C) Bundle of His
D) Purkinje network

Question 20

In the heart, what plays a role in generating impulses and mediating the heart's pacemaker function?

A) Sodium
B) Potassium
C) Magnesium
D) Calcium

Question 21

What does the blood pressure measurement record?

A) Action potential
B) Pulse rate
C) Cardiac output
D) Peripheral vascular resistance

Question 22

Which of the following would be a primary source of potassium?

A) Table salt
B) Milk and yogurt
C) Nuts and seeds
D) White beans

Question 23

An extrasystole is a(n)_______________.

A) lost rhythm in time or force
B) premature rhythm
C) abnormal rhythm
D) irregular rhythm

Question 24

The more blood that can fill the ventricles in one atrial contraction equates to a higher ______________.

A) pulse pressure
B) cardiac output
C) blood pressure
D) stroke volume

Question 25

What system sets the proper heart rate based on the body's demand for oxygen?

A) Conduction
B) Sympathetic nervous
C) Circulatory
D) Electrical

Question 26

What is the number of heart beats in a minute called?

A) Cardiac output
B) Stroke volume
C) Heart rate
D) Cardiac cycle

Question 27

What is computed by multiplying cardiac output by peripheral vascular resistance?

A) Contractility
B) Blood pressure
C) Pulse pressure
D) Stroke volume

Question 28

Which of the following is the amount of resistance the heart must use to pump the blood through the cardiovascular system?

A) Preload
B) Stoke volume
C) Afterload
D) Cardiac output

Question 29

What internodal pathway leaves the SA node and travels through the right atrial muscle posteriorly toward the AV node?

A) Thorel's pathway
B) Bundle of His
C) Bachmann's bundle
D) Wenchebach's bundle

Question 30

Not having enough cardiac output can attribute to ___________.

A) hypercalcemia
B) hypertension
C) hypernatremia
D) hyperkalemia

Question 31

What is the function of the AV node?

A) To generate electrical impulses
B) To start the electrical impulse, which will cause the heart to contract
C) To act as a passage way between the upper and lower chambers of the heart
D) To accept and slow the electrical impulse from the SA node

Question 32

Which of the following is the first of three electrical changes the myocardial cells experience?

A) Repolarization
B) Refractory period
C) Polarization
D) Depolarization

Question 33

To calculate ___________, subtract the diastolic blood pressure from the systolic blood pressure.

A) afterload
B) preload
C) pulse pressure
D) peripheral vascular resistance

Question 34

The normal adult will have a stroke volume of how many milliliters (mL) per heartbeat?

A) 70 mL
B) 120 mL
C) 3360 mL
D) 4620 mL

Question 35

Pulse pressure is a good indicator of which of the following?

A) Cardiac output
B) Stroke volume
C) Blood pressure
D) Heart rate