Question 1

The amount of blood returning to the heart is the ________.

Accepted Answer

The answer of The amount of blood returning to the...

Question 2

The action potentials of myocardial autorhythmic cells, are due to a combination of increasing Na²⁺ ________ and decreasing K⁺ ________.

Accepted Answer

A)  influx, efflux 
B)  efflux, influx 
C)  influx, influx 
D)  efflux, efflux 
A)  influx, efflux 
B)  efflux, influx 
C)  influx, influx 
D)  efflux, efflux

Question 3

Left ventricular pressure is higher than pressure in the aorta during

Accepted Answer

A)  atrial systole only. 
B)  ventricular diastole only. 
C)  ventricular systole only. 
D)  atrial systole and ventricular systole. 
E)  All of the answers are correct. 
A)  atrial systole only. 
B)  ventricular diastole only. 
C)  ventricular systole only. 
D)  atrial systole and ventricular systole. 
E)  All of the answers are correct.

Question 4

The term used to describe the amount of blood in the ventricle available to be pumped out of the heart during the next contraction is

Accepted Answer

A)  cardiac output (CO). 
B)  heart rate (HR). 
C)  end-diastolic volume (EDV). 
D)  stroke volume (SV). 
E)  end-systolic volume (ESV). 
A)  cardiac output (CO). 
B)  heart rate (HR). 
C)  end-diastolic volume (EDV). 
D)  stroke volume (SV). 
E)  end-systolic volume (ESV).

Question 5

If blood pressure doubled at the same time that the peripheral resistance doubled, the blood flow through a vessel would be

Accepted Answer

A)  doubled. 
B)  halved. 
C)  16 times greater. 
D)  1/16 as much. 
E)  unchanged. 
A)  doubled. 
B)  halved. 
C)  16 times greater. 
D)  1/16 as much. 
E)  unchanged.

Question 6

The chambers of the heart that pump blood into the arteries are the ________.

Accepted Answer

The answer of The chambers of the heart that pump...

Question 7

The P wave of an ECG corresponds to

Accepted Answer

A)  the depolarization of the atria. 
B)  the progressive wave of ventricular depolarization. 
C)  the repolarization of the ventricles. 
D)  atrial repolarization. 
E)  None of the answers are correct. 
A)  the depolarization of the atria. 
B)  the progressive wave of ventricular depolarization. 
C)  the repolarization of the ventricles. 
D)  atrial repolarization. 
E)  None of the answers are correct.

Question 8

Explain what is meant by the terms respiratory pump and skeletal muscle pump.Why are these important to the cardiovascular system?

Accepted Answer

Both refer to pressure exerted on the bl

Question 9

Miguel is a 25-year-old jogger with a target heart rate of 125 bpm.His resting pulse is 70 bpm.His blood volume is approximately 6.8 liters.At rest, his cardiac output is 6.3 liters/min.
A.What must his stroke volume be?
B.What might his EDV and ESV be?
C.During his workout, his heart rate increases to 125 bpm and his cardiac output to 12,500 mL/min.Do his SV, EDV, and ESV change with exercise?

Accepted Answer

A.90 mL CO = SV * HR; SV = CO/HR = 6.3 L

Question 10

You are constructing working models of the heart for extra credit.Your first attempt failed because the cells separated from each other during beating.What structures did you omit, and why did this allow the heart to fall apart? You omitted the gap junctions in your second attempt.How would a real heart fail to function normally without gap junctions?

Accepted Answer

Desmosomes were omitted.Without desmosom

Question 11

A heart with cells contracting rapidly in a disorganized manner, with no effective pumping action, is said to be in ________.

Accepted Answer

The answer of A heart with cells contracting rapidly in...

Question 12

A person has a total blood volume of 5 L.Of this total, 4 liters is contained in the systemic circulation and 1 L in the pulmonary circulation.If the person has a cardiac output of 5 L/min:
A.how long will it take for a drop of blood leaving the left ventricle to return to the heart?
B.how long will it take a drop of blood to go from the right ventricle to the left ventricle?

Accepted Answer

A.SV = 5 L/min, volume = 4 L, which woul

Question 13

An increase in blood vessel diameter is known as ________.

Accepted Answer

The answer of An increase in blood vessel diameter is...

Question 14

Drugs known as beta blockers will

Accepted Answer

A)  increase heart rate. 
B)  decrease heart rate. 
C)  increase stroke volume. 
D)  increase cardiac output. 
E)  decrease the end-systolic volume. 
A)  increase heart rate. 
B)  decrease heart rate. 
C)  increase stroke volume. 
D)  increase cardiac output. 
E)  decrease the end-systolic volume.

Question 15

The heart is enclosed in the ________.

Accepted Answer

pericardia

Question 16

If there is a blockage between the AV node and the AV bundle, how will this affect the appearance of the electrocardiogram?

Accepted Answer

A)  The PR interval will be smaller. 
B)  The QRS interval will be longer. 
C)  There will be more P waves than QRS complexes. 
D)  There will be more QRS complexes than P waves. 
E)  The T wave will disappear. 
A)  The PR interval will be smaller. 
B)  The QRS interval will be longer. 
C)  There will be more P waves than QRS complexes. 
D)  There will be more QRS complexes than P waves. 
E)  The T wave will disappear.

Question 17

________ are blood vessels that carry blood away from the heart.

Accepted Answer

The answer of ________ are blood vessels that carry blood...

Question 18

If the membranes of the cardiac muscle cells in the SA node become more permeable to potassium ions,

Accepted Answer

A)  the heart rate will increase. 
B)  the heart rate will decrease. 
C)  the membrane will depolarize. 
D)  the stroke volume will increase. 
E)  the intracellular concentration of calcium ion will increase. 
A)  the heart rate will increase. 
B)  the heart rate will decrease. 
C)  the membrane will depolarize. 
D)  the stroke volume will increase. 
E)  the intracellular concentration of calcium ion will increase.

Question 19

Match the change with the cardiovascular event described.
-During fasting, some capillary beds in the digestive tract are closed and therefore have no blood flow.Others are open to meet the minimal need of the tract for blood flow.During eating and as long as food is present in the tract, all capillary beds open to flow.What happens to total cross-sectional area of vessels in the digestive tract?

Accepted Answer

A) increased 
B) decreased 
C) unchanged 
D) stopped 
A) increased 
B) decreased 
C) unchanged 
D) stopped

Question 20

Using the figure below (Fig.14.18 from your text), calculate the following values:
   
A.Heart rate
B.Stroke volume
C.Cardiac output
D.Mean Arterial Pressure

Accepted Answer

A.(1 cycle/800 msec) × (1000 msec/sec) ×

Exam 14: Cardiovascular Physiology

The amount of blood returning to the heart is the ________.

The action potentials of myocardial autorhythmic cells, are due to a combination of increasing Na²⁺ ________ and decreasing K⁺ ________.

Left ventricular pressure is higher than pressure in the aorta during

The term used to describe the amount of blood in the ventricle available to be pumped out of the heart during the next contraction is

If blood pressure doubled at the same time that the peripheral resistance doubled, the blood flow through a vessel would be

The chambers of the heart that pump blood into the arteries are the ________.

The P wave of an ECG corresponds to

Explain what is meant by the terms respiratory pump and skeletal muscle pump.Why are these important to the cardiovascular system?

A heart with cells contracting rapidly in a disorganized manner, with no effective pumping action, is said to be in ________.

An increase in blood vessel diameter is known as ________.

Drugs known as beta blockers will

The heart is enclosed in the ________.

If there is a blockage between the AV node and the AV bundle, how will this affect the appearance of the electrocardiogram?

________ are blood vessels that carry blood away from the heart.

If the membranes of the cardiac muscle cells in the SA node become more permeable to potassium ions,

Using the figure below (Fig.14.18 from your text), calculate the following values: A.Heart rate B.Stroke volume C.Cardiac output D.Mean Arterial Pressure

Introduction to Physiology

Molecular Interactions

Compartmentation: Cells and Tissues

Energy and Cellular Metabolism

Membrane Dynamics

Communication, Integration, and Homeostasis

Introduction to the Endocrine System

Neurons: Cellular and Network Properties

The Central Nervous System

Sensory Physiology

Efferent Division: Autonomic and Somatic Motor Control

Muscles

Integrative Physiology I: Control of Body Movement

Blood Flow and the Control of Blood Pressure

Blood

Mechanics of Breathing

Gas Exchange and Transport

The Kidneys

Integrative Physiology II: Fluid and Electrolyte Balance

The Digestive System

Metabolism and Energy Balance

Endocrine Control of Growth and Metabolism

The Immune System

Integrative Physiology III: Exercise

Reproduction and Development

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The action potentials of myocardial autorhythmic cells, are due to a combination of increasing Na²⁺ and decreasing K⁺ .