Question 1

During heart failure,

Accepted Answer

A)  The Frank-Starling curve is shifted to the left. 
B)  The heart pumps out a smaller stroke volume than normal for a given EDV. 
C)  A compensatory increase in sympathetic activity increases the contractility of the heart to normal in the early stages of the disease. 
D)  All of these. 
E)  The heart pumps out a smaller stroke volume than normal for a given EDV, and a compensatory increase in sympathetic activity increases the contractility of the heart to normal in the early stages of the disease. 
A)  The Frank-Starling curve is shifted to the left. 
B)  The heart pumps out a smaller stroke volume than normal for a given EDV. 
C)  A compensatory increase in sympathetic activity increases the contractility of the heart to normal in the early stages of the disease. 
D)  All of these. 
E)  The heart pumps out a smaller stroke volume than normal for a given EDV, and a compensatory increase in sympathetic activity increases the contractility of the heart to normal in the early stages of the disease.

Question 2

Complete each of the following statements with increases, decreases, or has no effect on.
An increase in the parasympathetic activity ____________________ the AV-nodal delay.

Accepted Answer

The answer of Complete each of the following statements with...

Question 3

Which factor(s) would decrease cardiac output?

Accepted Answer

A)  increased venous return 
B)  decreased vagal stimulation of the heart 
C)  increased preload 
D)  decreased preload 
E)  increased venous return and increased preload 
A)  increased venous return 
B)  decreased vagal stimulation of the heart 
C)  increased preload 
D)  decreased preload 
E)  increased venous return and increased preload

Question 4

Normally, the stroke volume of the right side of the heart is the same as the stroke volume of the left side of the heart.

Accepted Answer

A) True 
 B)False

Question 5

Complete each of the following statements with increases, decreases, or has no effect on.
Increasing the afterload ____________________ the length of time the heart is in isovolumetric contraction.

Accepted Answer

The answer of Complete each of the following statements with...

Question 6

The average resting heart rate is normally established by the rhythm of autorhythmic cells located near the base of the right atrium.

Accepted Answer

A) True 
 B)False

Question 7

Increased ____ permeability of nodal cells hyperpolarizes the SA node.

Accepted Answer

A)  chloride 
B)  iodide 
C)  potassium 
D)  sodium 
E)  zinc 
A)  chloride 
B)  iodide 
C)  potassium 
D)  sodium 
E)  zinc

Question 8

The only point of electrical contact between the atria and the ventricles is the AV valve.

Accepted Answer

A) True 
 B)False

Question 9

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

Accepted Answer

A)  Excitation and contraction of the cardiac muscle fibers of each heart chamber should be coordinated to ensure efficient pumping. 
B)  The atria should be excited and contract before the onset of ventricular 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)  Excitation and contraction of the cardiac muscle fibers of each heart chamber should be coordinated to ensure efficient pumping, and the atria should be excited and contract before the onset of ventricular contraction to ensure that ventricular filling is complete. 
E)  The atria should be excited and contract before the onset of ventricular contraction to ensure that ventricular filling is complete, and the right side of the heart should contract first to ensure that oxygenated blood is delivered to the heart before the left side contracts. 
A)  Excitation and contraction of the cardiac muscle fibers of each heart chamber should be coordinated to ensure efficient pumping. 
B)  The atria should be excited and contract before the onset of ventricular 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)  Excitation and contraction of the cardiac muscle fibers of each heart chamber should be coordinated to ensure efficient pumping, and the atria should be excited and contract before the onset of ventricular contraction to ensure that ventricular filling is complete. 
E)  The atria should be excited and contract before the onset of ventricular contraction to ensure that ventricular filling is complete, and the right side of the heart should contract first to ensure that oxygenated blood is delivered to the heart before the left side contracts.

Question 10

Vasodilation of coronary arteries is induced by

Accepted Answer

A)  adenosine 
B)  nitroglycerin 
C)  nitric oxide 
D)  all of these 
E)  adenosine and nitroglycerin 
A)  adenosine 
B)  nitroglycerin 
C)  nitric oxide 
D)  all of these 
E)  adenosine and nitroglycerin

Question 11

The extent of ventricular filling is the preload of the heart, whereas the magnitude of the arterial blood pressure is the afterload of the heart.

Accepted Answer

A) True 
 B)False

Question 12

The amount of blood pumped out of the heart during each beat is known as the cardiac output.

Accepted Answer

A) True 
 B)False

Question 13

The AV and semilunar valves are never open at the same time.

Accepted Answer

A) True 
 B)False

Question 14

Cardiac output is equal to the EDV-ESV.

Accepted Answer

A) True 
 B)False

Question 15

Ventricular filling occurs more rapidly early in diastole than it does later in diastole.

Accepted Answer

A) True 
 B)False

Question 16

The stroke volume is the total volume of blood ejected by both ventricles each minute.

Accepted Answer

A) True 
 B)False

Question 17

Complete each of the following statments.
PAF is released from the ____________________ lining of vessels.

Accepted Answer

The answer of Complete each of the following statments.
PAF is...

Question 18

Complete each of the following statements with increases, decreases, or has no effect on.
Acetylcholine ____________________ the SA node's permeability to potassium ions; as a result, the length of time between successive T waves ____________________.

Accepted Answer

increases,

Question 19

The direction of the impulse through the conduction system of the heart is normally:

Accepted Answer

A)  AV node¾SA node¾bundle of His¾Purkinje fibers 
B)  AV node¾bundle of His¾SA node-¾Purkinje fibers 
C)  bundle of His¾AV node¾Purkinje fibers¾SA node 
D)  SA node¾AV node¾bundle of His¾Purkinje fibers 
E)  SA node¾bundle of His¾Purkinje fibers¾AV node 
A)  AV node¾SA node¾bundle of His¾Purkinje fibers 
B)  AV node¾bundle of His¾SA node-¾Purkinje fibers 
C)  bundle of His¾AV node¾Purkinje fibers¾SA node 
D)  SA node¾AV node¾bundle of His¾Purkinje fibers 
E)  SA node¾bundle of His¾Purkinje fibers¾AV node

Question 20

The heart

Accepted Answer

A)  is sympathetically innervated via cardiac nerve fibers 
B)  is parasympathetically innervated by vagus nerve fibers 
C)  is innervated by the phrenic nerve 
D)  is innervated by only the sympathetic division of the autonomic nervous system 
E)  is sympathetically innervated via cardiac nerve fibers and is parasympathetically innervated by vagus nerve fibers 
A)  is sympathetically innervated via cardiac nerve fibers 
B)  is parasympathetically innervated by vagus nerve fibers 
C)  is innervated by the phrenic nerve 
D)  is innervated by only the sympathetic division of the autonomic nervous system 
E)  is sympathetically innervated via cardiac nerve fibers and is parasympathetically innervated by vagus nerve fibers

Exam 9: A--Cardiac Physiology

During heart failure,

Complete each of the following statements with increases, decreases, or has no effect on. An increase in the parasympathetic activity ____________________ the AV-nodal delay.

Which factor(s) would decrease cardiac output?

Normally, the stroke volume of the right side of the heart is the same as the stroke volume of the left side of the heart.

Complete each of the following statements with increases, decreases, or has no effect on. Increasing the afterload ____________________ the length of time the heart is in isovolumetric contraction.

The average resting heart rate is normally established by the rhythm of autorhythmic cells located near the base of the right atrium.

Increased ____ permeability of nodal cells hyperpolarizes the SA node.

The only point of electrical contact between the atria and the ventricles is the AV valve.

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

Vasodilation of coronary arteries is induced by

The extent of ventricular filling is the preload of the heart, whereas the magnitude of the arterial blood pressure is the afterload of the heart.

The amount of blood pumped out of the heart during each beat is known as the cardiac output.

The AV and semilunar valves are never open at the same time.

Cardiac output is equal to the EDV-ESV.

Ventricular filling occurs more rapidly early in diastole than it does later in diastole.

The stroke volume is the total volume of blood ejected by both ventricles each minute.

Complete each of the following statments. PAF is released from the ____________________ lining of vessels.

Complete each of the following statements with increases, decreases, or has no effect on. Acetylcholine ____________________ the SA node's permeability to potassium ions; as a result, the length of time between successive T waves ____________________.

The direction of the impulse through the conduction system of the heart is normally:

The heart

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

Complete each of the following statements with increases, decreases, or has no effect on. Acetylcholine the SA node's permeability to potassium ions; as a result, the length of time between successive T waves .