Question 1

The long refractory period of cardiac muscle prevents tetanic contractions of the heart.

Accepted Answer

A) True 
 B)False

Question 2

Which of these statements correctly describes cardiac fibrillation?

Accepted Answer

A) backflow of blood throughout the heart 
B) coordinated function of nodal cells 
C)  failure of the heart valves and blood vessels to function 
D)  uncoordinated excitation and contraction of cardiac cells 
A) backflow of blood throughout the heart 
B) coordinated function of nodal cells 
C)  failure of the heart valves and blood vessels to function 
D)  uncoordinated excitation and contraction of cardiac cells

Question 3

Stroke volume is determined by the extent of venous return and parasympathetic activity.

Accepted Answer

A) True 
 B)False

Question 4

Sympathetic stimulation of the heart increases calcium permeability.

Accepted Answer

A) True 
 B)False

Question 5

Which of these statements correctly describes the AV node?

Accepted Answer

A) It is the normal pacemaker of the heart. 
B) It is the only electrical connection between the atria and the ventricles. 
C)  It rapidly conducts the impulse from the atria to the ventricles so that they contract simultaneously. 
D)  It is not innervated by the vagus. 
A) It is the normal pacemaker of the heart. 
B) It is the only electrical connection between the atria and the ventricles. 
C)  It rapidly conducts the impulse from the atria to the ventricles so that they contract simultaneously. 
D)  It is not innervated by the vagus.

Question 6

Which of these statements correctly describes cardiac output?

Accepted Answer

A) the volume of blood pumped by each ventricle during each contraction or beat 
B) the volume of blood pumped by each ventricle per minute 
C)  stroke volume × SVR (systemic vascular resistance) 
D)  the volume of blood pumped by each atrium into ventricles 
A) the volume of blood pumped by each ventricle during each contraction or beat 
B) the volume of blood pumped by each ventricle per minute 
C)  stroke volume × SVR (systemic vascular resistance) 
D)  the volume of blood pumped by each atrium into ventricles

Question 7

An increase in cardiac sympathetic activity ____________________ the contractility of the ventricles.

Accepted Answer

The answer of An increase in cardiac sympathetic activity ____________________...

Question 8

Which of these terms refers to the term systole?

Accepted Answer

A) closure 
B) conduction 
C)  contraction 
D)  opening 
A) closure 
B) conduction 
C)  contraction 
D)  opening

Question 9

The action potential impulse passes through the AV node between the P wave and QRS complex.

Accepted Answer

A) True 
 B)False

Question 10

HDLs have less protein than LDLs.

Accepted Answer

A) True 
 B)False

Question 11

Which vessel carries blood with a comparatively high concentration of oxygen?

Accepted Answer

A) chordae tendineae 
B) inferior vena cava 
C)  pulmonary artery 
D)  pulmonary vein 
A) chordae tendineae 
B) inferior vena cava 
C)  pulmonary artery 
D)  pulmonary vein

Question 12

Ninety-nine percent of the cardiac fibres are specialized for ____________________ whereas the remainder are specialized for ____________________.

Accepted Answer

contraction; conduct

Question 13

Match the effects with sympathetic or parasympathetic stimulation (or neither) of the heart. (Options may be used more than once or not at all.)
a.effect caused by sympathetic stimulation
b.effect caused by parasympathetic stimulation
c.not brought about by either sympathetic or parasympathetic stimulation
-increases the AV nodal delay

Accepted Answer

The answer of Match the effects with sympathetic or parasympathetic...

Question 14

Which of the following statements correctly describes the Frank-Starling law of the heart?

Accepted Answer

A) The shorter the initial length of the cardiac muscle fibres prior to contraction, the more forceful will be the subsequent contraction because the fibres are already partially contracted. 
B) Increasing the venous return increases the end-diastolic volume, which leads to an increased stroke volume, so the heart normally pumps out all the blood returned to it. 
C)  As cardiac output is reduced, blood pools in the vasculature so that arterial blood pressure increases. 
D)  The output of the left side of the heart must always exceed that of the right side of the heart because the right side pumps blood only to the lungs, whereas the left side must pump blood to the rest of the body. 
A) The shorter the initial length of the cardiac muscle fibres prior to contraction, the more forceful will be the subsequent contraction because the fibres are already partially contracted. 
B) Increasing the venous return increases the end-diastolic volume, which leads to an increased stroke volume, so the heart normally pumps out all the blood returned to it. 
C)  As cardiac output is reduced, blood pools in the vasculature so that arterial blood pressure increases. 
D)  The output of the left side of the heart must always exceed that of the right side of the heart because the right side pumps blood only to the lungs, whereas the left side must pump blood to the rest of the body.

Question 15

The action potential spreads through the atria by gap junctions, but there are no gap junctions present in the ventricles, so the impulse must be propagated throughout the ventricular myocardium by the bundle of His and Purkinje system.

Accepted Answer

A) True 
 B)False

Question 16

Which heart chamber has the greatest workload?

Accepted Answer

A) right ventricle 
B) left ventricle 
C)  left atrium 
D)  right atrium 
A) right ventricle 
B) left ventricle 
C)  left atrium 
D)  right atrium

Question 17

Which is the result of vagal influences on the heart?

Accepted Answer

A) enhanced potassium permeability at the SA node 
B) enhanced calcium permeability at the SA node 
C)  more frequent depolarization of the SA node 
D)  stimulation of the heart by epinephrine 
A) enhanced potassium permeability at the SA node 
B) enhanced calcium permeability at the SA node 
C)  more frequent depolarization of the SA node 
D)  stimulation of the heart by epinephrine

Question 18

Which of these criteria must be met for the heart to function efficiently?

Accepted Answer

A) Excitation and consequently contraction of the cardiac muscle fibres of each heart chamber should be coordinated to ensure efficient pumping. 
B) The ventricles should be excited and contract before the onset of atrial contraction to ensure that ventricular filling is complete. 
C)  The right side of the heart should contract first to ensure that oxygenated blood is delivered to the heart before the left side contracts. 
D)  The fluid pressure in the pericardial cavity must be high for the heart to function efficiently 
A) Excitation and consequently contraction of the cardiac muscle fibres of each heart chamber should be coordinated to ensure efficient pumping. 
B) The ventricles should be excited and contract before the onset of atrial contraction to ensure that ventricular filling is complete. 
C)  The right side of the heart should contract first to ensure that oxygenated blood is delivered to the heart before the left side contracts. 
D)  The fluid pressure in the pericardial cavity must be high for the heart to function efficiently

Question 19

Match the cardiovascular features, labelled a. through d., with their correct characteristic.
a.angina pectoris
b.embolus
c.atherosclerosis
d.thrombus
-abnormal clot attached to a vessel wall

Accepted Answer

The answer of Match the cardiovascular features, labelled a. through...

Question 20

When does the aortic semilunar valve open?

Accepted Answer

A) when ventricular pressure exceeds aortic pressure 
B) at the start of systole 
C)  at the maximum ventricular pressure 
D)  immediately after atrial contraction 
A) when ventricular pressure exceeds aortic pressure 
B) at the start of systole 
C)  at the maximum ventricular pressure 
D)  immediately after atrial contraction

The long refractory period of cardiac muscle prevents tetanic contractions of the heart.

Which of these statements correctly describes cardiac fibrillation?

Stroke volume is determined by the extent of venous return and parasympathetic activity.

Sympathetic stimulation of the heart increases calcium permeability.

Which of these statements correctly describes the AV node?

Which of these statements correctly describes cardiac output?

An increase in cardiac sympathetic activity ____________________ the contractility of the ventricles.

Which of these terms refers to the term systole?

The action potential impulse passes through the AV node between the P wave and QRS complex.

HDLs have less protein than LDLs.

Which vessel carries blood with a comparatively high concentration of oxygen?

Ninety-nine percent of the cardiac fibres are specialized for whereas the remainder are specialized for .

Which of the following statements correctly describes the Frank-Starling law of the heart?

The action potential spreads through the atria by gap junctions, but there are no gap junctions present in the ventricles, so the impulse must be propagated throughout the ventricular myocardium by the bundle of His and Purkinje system.

Which heart chamber has the greatest workload?

Which is the result of vagal influences on the heart?

Which of these criteria must be met for the heart to function efficiently?

Match the cardiovascular features, labelled a. through d., with their correct characteristic. a.angina pectoris b.embolus c.atherosclerosis d.thrombus -abnormal clot attached to a vessel wall

When does the aortic semilunar valve open?

Introduction to Physiology and Homeostasis

Cell Physiology

The Plasma Membrane and Membrane Potential

Principles of Neural and Hormonal Communication

The Central Nervous System

The Peripheral Nervous System: Afferent Division; Special Senses

Muscle Physiology

Cardiac Physiology

The Blood Vessels and Blood Pressure

The Blood

Body Defenses

The Respiratory System

The Urinary System

Fluid and Acidbase Balance

The Digestive System

Energy Balance and Temperature Regulation

Filters

Exam 7: The Peripheral Nervous System: Efferent Division

The long refractory period of cardiac muscle prevents tetanic contractions of the heart.

Which of these statements correctly describes cardiac fibrillation?

Stroke volume is determined by the extent of venous return and parasympathetic activity.

Sympathetic stimulation of the heart increases calcium permeability.

Which of these statements correctly describes the AV node?

Which of these statements correctly describes cardiac output?

An increase in cardiac sympathetic activity ____________________ the contractility of the ventricles.

Which of these terms refers to the term systole?

The action potential impulse passes through the AV node between the P wave and QRS complex.

HDLs have less protein than LDLs.

Which vessel carries blood with a comparatively high concentration of oxygen?

Ninety-nine percent of the cardiac fibres are specialized for ____________________ whereas the remainder are specialized for ____________________.

Which of the following statements correctly describes the Frank-Starling law of the heart?

The action potential spreads through the atria by gap junctions, but there are no gap junctions present in the ventricles, so the impulse must be propagated throughout the ventricular myocardium by the bundle of His and Purkinje system.

Which heart chamber has the greatest workload?

Which is the result of vagal influences on the heart?

Which of these criteria must be met for the heart to function efficiently?

Match the cardiovascular features, labelled a. through d., with their correct characteristic. a.angina pectoris b.embolus c.atherosclerosis d.thrombus -abnormal clot attached to a vessel wall

When does the aortic semilunar valve open?

Introduction to Physiology and Homeostasis

Cell Physiology

The Plasma Membrane and Membrane Potential

Principles of Neural and Hormonal Communication

The Central Nervous System

The Peripheral Nervous System: Afferent Division; Special Senses

Muscle Physiology

Cardiac Physiology

The Blood Vessels and Blood Pressure

The Blood

Body Defenses

The Respiratory System

The Urinary System

Fluid and Acidbase Balance

The Digestive System

Energy Balance and Temperature Regulation

Filters

Ninety-nine percent of the cardiac fibres are specialized for whereas the remainder are specialized for .