Question 1

Which of the following describes the first heart sound

Accepted Answer

A) It occurs when the AV valves open. 
B) It occurs when the semilunar valves close. 
C) It signals the end of ventricular systole. 
D) It signals the onset of ventricular systole. 
A) It occurs when the AV valves open. 
B) It occurs when the semilunar valves close. 
C) It signals the end of ventricular systole. 
D) It signals the onset of ventricular systole.

Question 2

The heart muscle receives its oxygen and nutrients directly from the blood within its chambers during ventricular diastole.

Accepted Answer

A) True 
 B)False

Question 3

Match the EKG features, labelled a. through f., with their correct characteristic.
-time during which ventricles are contracting and emptying

Accepted Answer

A) P wave 
B) QRS complex 
C) T wave 
D) PR interval 
E) TP interval
F)ST segment 
A) P wave 
B) QRS complex 
C) T wave 
D) PR interval 
E) TP interval
F)ST segment

Question 4

When does the aortic semilunar valve open

Accepted Answer

A) when ventricular pressure exceeds aortic pressure 
B) when systole starts 
C) when ventricular pressure is maximum 
D) immediately after atrial contraction 
A) when ventricular pressure exceeds aortic pressure 
B) when systole starts 
C) when ventricular pressure is maximum 
D) immediately after atrial contraction

Question 5

Pacemaker activity by the Purkinje fibres is an example of an ectopic focus.

Accepted Answer

A) True 
 B)False

Question 6

Match the ions, labelled a. through c., with the events being described. (Options may be used more than once or not at all.)
-Parasympathetic stimulation increases the permeability of the SA node to _____, whereas sympathetic stimulation decreases the permeability to this same ion.

Accepted Answer

A) K⁺ 
B) Na+ 
C) Ca²⁺ 
A) K⁺ 
B) Na+ 
C) Ca²⁺

Question 7

On a normal ECG, a wave for repolarization of the atria is not recorded.Why

Accepted Answer

A) The leads are not placed in a position to pick it up. 
B) No repolarization of the atria occurs normally. 
C) It occurs simultaneously with ventricular depolarization and is masked by the QRS complex. 
D) It does not travel through body fluids. 
A) The leads are not placed in a position to pick it up. 
B) No repolarization of the atria occurs normally. 
C) It occurs simultaneously with ventricular depolarization and is masked by the QRS complex. 
D) It does not travel through body fluids.

Question 8

With 2:1 rhythm, the atrial rate is very rapid and the ventricular rate is normal or above normal, whereas with 2:1 block, the atrial rate is normal but the ventricular rate is below normal

Accepted Answer

A) True 
 B)False

Question 9

If the EDV were held constant, what could accomplish increased stroke volume

Accepted Answer

A) increased sympathetic nerve activity to the heart 
B) increased parasympathetic nerve activity to the heart 
C) decreased contractility 
D) increased arterial blood pressure 
A) increased sympathetic nerve activity to the heart 
B) increased parasympathetic nerve activity to the heart 
C) decreased contractility 
D) increased arterial blood pressure

Question 10

The second heart sound is due to closure of the AV valves.

Accepted Answer

A) True 
 B)False

Question 11

The aortic valve prevents backflow of blood from the aorta into the left ventricle during ventricular diastole.

Accepted Answer

A) True 
 B)False

Question 12

What does a whistling murmur heard between the first and second heart sounds indicate

Accepted Answer

A) a stenotic AV valve 
B) an insufficient AV valve 
C) a stenotic aortic or pulmonary semilunar valve 
D) an insufficient aortic or pulmonary semilunar valve 
A) a stenotic AV valve 
B) an insufficient AV valve 
C) a stenotic aortic or pulmonary semilunar valve 
D) an insufficient aortic or pulmonary semilunar valve

Question 13

The end-diastolic volume is the maximum amount of blood in the ventricle after ventricular filling is complete.

Accepted Answer

A) True 
 B)False

Question 14

Cardiac output is equal to which of the following

Accepted Answer

A) the difference between end-diastolic volume (EDV) and end-systolic volume (ESV× HR) 
B) the product of heart rate and EDV 
C) the difference between the stroke volume at rest and the stroke volume during exercise 
D) stroke volume minus end-systolic volume 
A) the difference between end-diastolic volume (EDV) and end-systolic volume (ESV× HR) 
B) the product of heart rate and EDV 
C) the difference between the stroke volume at rest and the stroke volume during exercise 
D) stroke volume minus end-systolic volume

Question 15

The ____________________ is the normal pacemaker of the heart.

Accepted Answer

The answer of The ____________________ is the normal pacemaker of...

Question 16

Cardiac output is stroke volume times the heart rate.

Accepted Answer

A) True 
 B)False

Question 17

The cardiac output is the same as the cardiac reserve of the heart.

Accepted Answer

A) True 
 B)False

Question 18

Match the ions, labelled a. through c., with the events being described. (Options may be used more than once or not at all.)
-The rapid falling phase of the cardiac action potential is brought about primarily by the outward diffusion of _____.

Accepted Answer

A) K⁺ 
B) Na+ 
C) Ca²⁺ 
A) K⁺ 
B) Na+ 
C) Ca²⁺

Question 19

An increase in parasympathetic activity ____________________ the stroke volume.

Accepted Answer

The answer of An increase in parasympathetic activity ____________________ the...

Question 20

Match the effects with sympathetic or parasympathetic stimulation (or neither) of the heart. (Options may be used more than once or not at all.)
-increases the contractility of the atrial and ventricular muscle

Accepted Answer

A) effect caused by sympathetic stimulation 
B) effect caused by parasympathetic stimulation 
C) not brought about by either sympathetic or parasympathetic stimulation 
A) effect caused by sympathetic stimulation 
B) effect caused by parasympathetic stimulation 
C) not brought about by either sympathetic or parasympathetic stimulation

Which of the following describes the first heart sound

The heart muscle receives its oxygen and nutrients directly from the blood within its chambers during ventricular diastole.

Match the EKG features, labelled a. through f., with their correct characteristic. -time during which ventricles are contracting and emptying

When does the aortic semilunar valve open

Pacemaker activity by the Purkinje fibres is an example of an ectopic focus.

Match the ions, labelled a. through c., with the events being described. (Options may be used more than once or not at all.) -Parasympathetic stimulation increases the permeability of the SA node to _____, whereas sympathetic stimulation decreases the permeability to this same ion.

On a normal ECG, a wave for repolarization of the atria is not recorded.Why

With 2:1 rhythm, the atrial rate is very rapid and the ventricular rate is normal or above normal, whereas with 2:1 block, the atrial rate is normal but the ventricular rate is below normal

If the EDV were held constant, what could accomplish increased stroke volume

The second heart sound is due to closure of the AV valves.

The aortic valve prevents backflow of blood from the aorta into the left ventricle during ventricular diastole.

What does a whistling murmur heard between the first and second heart sounds indicate

The end-diastolic volume is the maximum amount of blood in the ventricle after ventricular filling is complete.

Cardiac output is equal to which of the following

The ____________________ is the normal pacemaker of the heart.

Cardiac output is stroke volume times the heart rate.

The cardiac output is the same as the cardiac reserve of the heart.

Match the ions, labelled a. through c., with the events being described. (Options may be used more than once or not at all.) -The rapid falling phase of the cardiac action potential is brought about primarily by the outward diffusion of _____.

An increase in parasympathetic activity ____________________ the stroke volume.

Match the effects with sympathetic or parasympathetic stimulation (or neither) of the heart. (Options may be used more than once or not at all.) -increases the contractility of the atrial and ventricular muscle

The Foundation of Physiology

Cell Physiology

The Central Nervous System

The Peripheral Nervous System: Sensory, Autonomic, Somatic

Principles of Endocrinology: The Central Endocrine Glands

The Endocrine Glands

Muscle Physiology

Vascular Physiology

The Blood

Body Defences

The Respiratory System

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Fluid and Acidbase Balance

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Energy Balance and Temperature Regulation

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Exam 8: Cardiac Physiology

Which of the following describes the first heart sound

The heart muscle receives its oxygen and nutrients directly from the blood within its chambers during ventricular diastole.

Match the EKG features, labelled a. through f., with their correct characteristic. -time during which ventricles are contracting and emptying

When does the aortic semilunar valve open

Pacemaker activity by the Purkinje fibres is an example of an ectopic focus.

Match the ions, labelled a. through c., with the events being described. (Options may be used more than once or not at all.) -Parasympathetic stimulation increases the permeability of the SA node to _____, whereas sympathetic stimulation decreases the permeability to this same ion.

On a normal ECG, a wave for repolarization of the atria is not recorded.Why

With 2:1 rhythm, the atrial rate is very rapid and the ventricular rate is normal or above normal, whereas with 2:1 block, the atrial rate is normal but the ventricular rate is below normal

If the EDV were held constant, what could accomplish increased stroke volume

The second heart sound is due to closure of the AV valves.

The aortic valve prevents backflow of blood from the aorta into the left ventricle during ventricular diastole.

What does a whistling murmur heard between the first and second heart sounds indicate

The end-diastolic volume is the maximum amount of blood in the ventricle after ventricular filling is complete.

Cardiac output is equal to which of the following

The ____________________ is the normal pacemaker of the heart.

Cardiac output is stroke volume times the heart rate.

The cardiac output is the same as the cardiac reserve of the heart.

Match the ions, labelled a. through c., with the events being described. (Options may be used more than once or not at all.) -The rapid falling phase of the cardiac action potential is brought about primarily by the outward diffusion of _____.

An increase in parasympathetic activity ____________________ the stroke volume.

Match the effects with sympathetic or parasympathetic stimulation (or neither) of the heart. (Options may be used more than once or not at all.) -increases the contractility of the atrial and ventricular muscle

The Foundation of Physiology

Cell Physiology

The Central Nervous System

The Peripheral Nervous System: Sensory, Autonomic, Somatic

Principles of Endocrinology: The Central Endocrine Glands

The Endocrine Glands

Muscle Physiology

Vascular Physiology

The Blood

Body Defences

The Respiratory System

The Urinary System

Fluid and Acidbase Balance

The Digestive System

Energy Balance and Temperature Regulation

The Reproductive System

Filters