Question 1

Cardiac output

Accepted Answer

A)  is the volume of blood pumped by each ventricle during each contraction or beat 
B)  is the volume of blood pumped by each ventricle per minute 
C)  equals heart rate x stroke volume 
D)  is the volume of blood pumped by each ventricle during each contraction or beat, and equals heart rate x stroke volume 
E)  is the volume of blood pumped by each ventricle per minute, and equals heart rate x stroke volume 
A)  is the volume of blood pumped by each ventricle during each contraction or beat 
B)  is the volume of blood pumped by each ventricle per minute 
C)  equals heart rate x stroke volume 
D)  is the volume of blood pumped by each ventricle during each contraction or beat, and equals heart rate x stroke volume 
E)  is the volume of blood pumped by each ventricle per minute, and equals heart rate x stroke volume

Question 2

The plateau phase of the action potential in a contractile cardiac muscle cell occurs as a result of activation of slow Ca2+ channels.

Accepted Answer

A) True 
 B)False

Question 3

An action potential impulse passes through the internodal pathways between the P wave and Q waves on an ECG.

Accepted Answer

A) True 
 B)False

Question 4

If the connection between the SA node and AV node becomes blocked,

Accepted Answer

A)  The QRS complex will be absent on an ECG. 
B)  The ventricles will beat more slowly. 
C)  The atria will beat slower. 
D)  Tachycardia will occur. 
E)  The QRS complex will be absent on an ECG and tachycardia will occur. 
A)  The QRS complex will be absent on an ECG. 
B)  The ventricles will beat more slowly. 
C)  The atria will beat slower. 
D)  Tachycardia will occur. 
E)  The QRS complex will be absent on an ECG and tachycardia will occur.

Question 5

Complete each of the following statements with increases, decreases, or has no effect on.
Norepinephrine ____________________ the SA node's permeability to Ca2+, which then ____________________ the length of time between subsequent heart beats.

Accepted Answer

increases,

Question 6

Most blood flow through the coronary vessels occurs during ventricular systole when the heart is driving blood forward.

Accepted Answer

A) True 
 B)False

Question 7

Which of the following decreases ESV?

Accepted Answer

A)  acetylcholine 
B)  preload 
C)  afterload 
D)  parasympathetic activity 
E)  vagal activity 
A)  acetylcholine 
B)  preload 
C)  afterload 
D)  parasympathetic activity 
E)  vagal activity

Question 8

The period lasting from closure of the AV valve to opening of the aortic valve is known as

Accepted Answer

A)  isovolumetric ventricular contraction 
B)  isovolumetric ventricular relaxation 
C)  the rapid ejection phase 
D)  the rapid filling phase 
E)  none of these 
A)  isovolumetric ventricular contraction 
B)  isovolumetric ventricular relaxation 
C)  the rapid ejection phase 
D)  the rapid filling phase 
E)  none of these

Question 9

Atrial flutter is characterized by a ____ rhythm, as impulses pass from the AV node to the ventricles.

Accepted Answer

A)  1:1 
B)  2:1 
C)  3:4 
D)  5:2 
E)  7:1 
A)  1:1 
B)  2:1 
C)  3:4 
D)  5:2 
E)  7:1

Question 10

Twelve complete ECG patterns are recorded over 10 seconds, which means the heart rate is ____ beats per minute.

Accepted Answer

A)  60 
B)  72 
C)  90 
D)  108 
E)  120 
A)  60 
B)  72 
C)  90 
D)  108 
E)  120

Question 11

Sequencing
Indicate the proper order of events during the cardiac cycle by placing numbers in the blanks preceding the events in sequence. (Some steps may have been omitted.) The first event is labeled as your starting point.
 $\begin{array}{|l|l|}
\hline 1& \text {AV valve open; aotic valve closec; ventricular filling occurring } \
\hline  &\text { Blood ejected from the ventricles } \
\hline  &\text {Is ovolumetric ventricular relaxation  } \
\hline  &\text {Atrial contraction } \
\hline  &\text {AV valve opens; ventricular filling occurs again; one carcliac cycle is complete } \
\hline  &\text {Aortic valve opens } \
\hline  &\text {SA node discharges } \
\hline  &\text {Ventricular filling complete } \
\hline  &\text {Ventricular relaxation begins } \
\hline  &\text {A artic valve closes } \
\hline  &\text {Is ovolumetric ventricular contraction } \
\hline  &\text { Ventricular contraction begins; AV valve closes} \
\hline 
\end{array}$

Accepted Answer

1, 8, 11,

Question 12

Ventricular systole is displayed as the QRS on the ECG, and ventricular diastole is displayed as the T wave.

Accepted Answer

A) True 
 B)False

Question 13

Blood returning from the lungs

Accepted Answer

A)  enters the right atrium 
B)  enters the left atrium 
C)  is poorly oxygenated 
D)  enters the right atrium and is poorly oxygenated 
E)  enters the left atrium and is poorly oxygenated 
A)  enters the right atrium 
B)  enters the left atrium 
C)  is poorly oxygenated 
D)  enters the right atrium and is poorly oxygenated 
E)  enters the left atrium and is poorly oxygenated

Question 14

The AV valve controls the amount of blood entering the atrium from the venous system.

Accepted Answer

A) True 
 B)False

Question 15

Adjacent cardiac muscle cells are joined together end-to-end in the ventricles by

Accepted Answer

A)  intercalated discs 
B)  sarcomeres 
C)  Purkinje fibers 
D)  sinoatrial nodes 
E)  atrioventricular nodes 
A)  intercalated discs 
B)  sarcomeres 
C)  Purkinje fibers 
D)  sinoatrial nodes 
E)  atrioventricular nodes

Question 16

The SA is the heart's normal pacemaker because

Accepted Answer

A)  It has the fastest rate of autorhythmicity. 
B)  It has both sympathetic and parasympathetic innervation. 
C)  It lies in the right atrium. 
D)  Activation of K+ channels occurs more rapidly in this region than elsewhere in the heart. 
E)  None of these. 
A)  It has the fastest rate of autorhythmicity. 
B)  It has both sympathetic and parasympathetic innervation. 
C)  It lies in the right atrium. 
D)  Activation of K+ channels occurs more rapidly in this region than elsewhere in the heart. 
E)  None of these.

Question 17

Complete each of the following statments. Vitamins ____________________ and ____________________ have been shown to slow plaque deposition in coronary arteries.

Accepted Answer

The answer of Complete each of the following statments. Vitamins...

Question 18

The cardiac output is equal to

Accepted Answer

A)  (EDV - ESV) x HR 
B)  heart rate x EDV 
C)  the difference between the stroke volume at rest and the stroke volume during exercise 
D)  the stroke volume minus the ESV 
E)  heart rate x blood pressure 
A)  (EDV - ESV) x HR 
B)  heart rate x EDV 
C)  the difference between the stroke volume at rest and the stroke volume during exercise 
D)  the stroke volume minus the ESV 
E)  heart rate x blood pressure

Question 19

The aortic valve

Accepted Answer

A)  prevents the backflow of blood into the aorta during ventricular diastole 
B)  prevents the backflow of blood into the left ventricle during ventricular diastole 
C)  prevents the backflow of blood into the right ventricle during ventricular diastole 
D)  closes when the first heart sound is heard 
E)  none of these 
A)  prevents the backflow of blood into the aorta during ventricular diastole 
B)  prevents the backflow of blood into the left ventricle during ventricular diastole 
C)  prevents the backflow of blood into the right ventricle during ventricular diastole 
D)  closes when the first heart sound is heard 
E)  none of these

Question 20

The chordae tendineae

Accepted Answer

A)  keep the AV valves from everting during ventricular systole 
B)  hold the AV valves open during diastole 
C)  hold the right and left ventricles together 
D)  transmit the electrical impulse from the atria to the ventricles 
E)  contract when the ventricles contract 
A)  keep the AV valves from everting during ventricular systole 
B)  hold the AV valves open during diastole 
C)  hold the right and left ventricles together 
D)  transmit the electrical impulse from the atria to the ventricles 
E)  contract when the ventricles contract

Exam 9: A--Cardiac Physiology

Cardiac output

The plateau phase of the action potential in a contractile cardiac muscle cell occurs as a result of activation of slow Ca2+ channels.

An action potential impulse passes through the internodal pathways between the P wave and Q waves on an ECG.

If the connection between the SA node and AV node becomes blocked,

Complete each of the following statements with increases, decreases, or has no effect on. Norepinephrine ____________________ the SA node's permeability to Ca2+, which then ____________________ the length of time between subsequent heart beats.

Most blood flow through the coronary vessels occurs during ventricular systole when the heart is driving blood forward.

Which of the following decreases ESV?

The period lasting from closure of the AV valve to opening of the aortic valve is known as

Atrial flutter is characterized by a ____ rhythm, as impulses pass from the AV node to the ventricles.

Twelve complete ECG patterns are recorded over 10 seconds, which means the heart rate is ____ beats per minute.

Ventricular systole is displayed as the QRS on the ECG, and ventricular diastole is displayed as the T wave.

Blood returning from the lungs

The AV valve controls the amount of blood entering the atrium from the venous system.

Adjacent cardiac muscle cells are joined together end-to-end in the ventricles by

The SA is the heart's normal pacemaker because

Complete each of the following statments. Vitamins ____________________ and ____________________ have been shown to slow plaque deposition in coronary arteries.

The cardiac output is equal to

The aortic valve

The chordae tendineae

Introduction to Physiology and Homeostasis

Cell Physiology

The Plasma Membrane and Membrane Potential

Principles of Neural and Hormonal Communication

A--The Central Nervous System

B--The Central Nervous System

A--The Peripheral Nervous System: Afferent Division; Special Senses

B--The Peripheral Nervous System: Afferent Division; Special Senses

The Peripheral Nervous System: Efferent Division

A--Muscle Physiology

B--Muscle Physiology

B--Cardiac Physiology

The Blood Vessels and Blood Pressure

The Blood

Body Defenses

A--The Respiratory System

B--The Respiratory System

A--The Urinary System

B--The Urinary System

A--Fluid and Acid-Base Balance

B--Fluid and Acid-Base Balance

A--The Digestive System

B--The Digestive System

Energy Balance and Temperature Regulation

A--Principles of Endocrinology: the Central Endocrine Glands

B--Principles of Endocrinology: the Central Endocrine Glands

A--The Peripheral Endocrine Glands

B--The Peripheral Endocrine Glands

A--The Reproductive System

B--The Reproductive System

Filters

The plateau phase of the action potential in a contractile cardiac muscle cell occurs as a result of activation of slow Ca²⁺ channels.

Complete each of the following statements with increases, decreases, or has no effect on. Norepinephrine the SA node's permeability to Ca2⁺, which then the length of time between subsequent heart beats.

Complete each of the following statments. Vitamins and have been shown to slow plaque deposition in coronary arteries.