Question 1

Cardiac output is defined as the volume of blood pumped by a(n) ________ each time it contracts.

Accepted Answer

A)  heart
B)  atrium
C)  atrioventricular valve
D)  ventricle

Question 2

During exercise, your cardiac output can increase dramatically in order to meet the metabolic demands of your tissues. If your heart rate increased to 150 beats per minute and the volume of blood pumped per beat is 75 mL, what is your cardiac output?

Accepted Answer

A)  5 L/min
B)  11.25 L/min
C)  11,250 L/min
D)  50,000 L/min

Question 3

An adult human's red blood cells are formed in the

Accepted Answer

A)  spleen.
B)  liver.
C)  bone marrow.
D)  thoracic cavity.

Question 4

You conduct a study with mice to determine whether giving them air with a higher than normal oxygen level results in their having a higher than normal oxygen content in their blood. What vessel should you draw blood from if you want to measure the highest potential level of oxygen content in the blood?

Accepted Answer

A)  superior vena cava
B)  pulmonary vein
C)  pulmonary artery
D)  aorta

Question 5

Using a stethoscope, you listen to a beating heart and hear "lub-dup, lub-dup." These sounds are created by

Accepted Answer

A)  muscles in the left ventricle.
B)  blood flowing through the aorta.
C)  blood pressure differentials from chamber to chamber.
D)  blood recoiling against the closed valves.

Question 6

At any given time, what percentage of the body's capillaries have blood flowing through them?

Accepted Answer

A)  5-10%
B)  20-25%
C)  40-50%
D)  85-90%

Question 7

Which of the following factors contributes to the flow of blood in veins?

Accepted Answer

A)  skeletal muscle contractions
B)  the number of red blood cells in venous blood
C)  the diameter of capillaries
D)  blood pressure generated by the heart

Question 8

The location of the heart's pacemaker is a specialized region of cardiac muscle called the

Accepted Answer

A)  atrioventricular node.
B)  sinoatrial node.
C)  Purkinje fibers.
D)  left ventricle.

Question 9

Which of the following can contribute to high blood pressure?

Accepted Answer

A)  regular exercise
B)  eating a heart-healthy diet
C)  smoking
D)  maintaining proper weight

Question 10

During ventricular systole, the ________ valves ________.

Accepted Answer

A)  AV; open
B)  semilunar; close
C)  semilunar; open
D)  AV and semilunar; close

Question 11

A woman has been standing in one place without moving for a long time. You walk by and notice that her ankles are swollen. What is a likely explanation for this observation?

Accepted Answer

A)  Since the woman has not flexed her leg muscles, blood has not moved upward through the veins so stays pooled at her ankles.
B)  The woman's blood pressure has likely increased because of inactivity, and thus the blood has pooled at the her ankles.
C)  Since the woman hasn't flexed her leg muscles, blood has not moved upward through the arteries so stays pooled at her ankles.
D)  The woman's heart rate has likely increased because of inactivity, and thus the blood has pooled at her ankles.

Question 12

Which of the following statements regarding blood pressure is false?

Accepted Answer

A)  Normal blood pressure for adult humans is usually at or below 120/80.
B)  Hypertension is defined as persistent systolic pressure above 120 and/or diastolic above 80.
C)  High blood pressure can lead to an enlarged and weakened heart, increased risk of heart attack, stroke, and kidney failure.
D)  The higher number in a blood pressure reading measures the force of a heart contraction.

Question 13

Stem cells found in the red marrow inside bones

Accepted Answer

A)  phagocytize bacterial cells.
B)  are primarily important in blood clotting.
C)  are responsible for an immune response.
D)  can differentiate into all blood cells and platelets.

Question 14

Blood clots are formed by platelets and the plasma protein

Accepted Answer

A)  thrombin.
B)  sealin.
C)  hemophilin.
D)  fibrinogen.

Question 15

The diameter of a capillary is about the same as that of

Accepted Answer

A)  a nerve.
B)  a red blood cell.
C)  an arteriole.
D)  a venule.

Question 16

Which of the following statements regarding circulatory systems is true?

Accepted Answer

A)  The smallest blood vessels in the body are veins.
B)  A circulatory system is necessary in any animal whose body is too large or too complex for vital chemicals to reach all parts of the body by diffusion.
C)  Materials are exchanged directly between the blood and body cells.
D)  Veins carry blood away from the heart to body organs and tissues.

Question 17

During which phase of the heartbeat does the heart fill with blood?

Accepted Answer

A)  resting phase
B)  diastole
C)  active phase
D)  systole

Question 18

Blood flow through capillaries is controlled by

Accepted Answer

A)  one-way valves.
B)  precapillary sphincters only.
C)  smooth muscle in the walls of arterioles only.
D)  precapillary sphincters and smooth muscle in the walls of arterioles.

Question 19

Myocardial infarction, also called a heart attack,

Accepted Answer

A)  is caused by excessive blood pressure in the heart.
B)  actually causes no permanent damage to the heart.
C)  is unrelated to cigarette smoking.
D)  is the damage or death of cardiac muscle tissue.

Question 20

In mammals, which of the following vessels transports oxygenated blood from the lung back to the heart?

Accepted Answer

A)  pulmonary artery
B)  pulmonary vein
C)  vena cava
D)  coronary artery

Exam 23: Circulation

Stem cells found in the red marrow inside bones

Correct Answer
verified

During exercise, your cardiac output can increase dramatically in order to meet the metabolic demands of your tissues. If your heart rate increased to 150 beats per minute and the volume of blood pumped per beat is 75 mL, what is your cardiac output?

Correct Answer
verified

Cardiac output is defined as the volume of blood pumped by a(n) ________ each time it contracts.

Correct Answer
verified

The location of the heart's pacemaker is a specialized region of cardiac muscle called the

Correct Answer
verified

In mammals, which of the following vessels transports oxygenated blood from the lung back to the heart?

Correct Answer
verified

An adult human's red blood cells are formed in the

Correct Answer
verified

Which of the following factors contributes to the flow of blood in veins?

Correct Answer
verified

Blood clots are formed by platelets and the plasma protein

Correct Answer
verified

Using a stethoscope, you listen to a beating heart and hear "lub-dup, lub-dup." These sounds are created by

Correct Answer
verified

During which phase of the heartbeat does the heart fill with blood?

Correct Answer
verified

Which of the following statements regarding blood pressure is false?

Correct Answer
verified

During ventricular systole, the valves .

Correct Answer
verified

At any given time, what percentage of the body's capillaries have blood flowing through them?

Correct Answer
verified

Myocardial infarction, also called a heart attack,

Correct Answer
verified

Which of the following statements regarding circulatory systems is true?

Correct Answer
verified

Which of the following can contribute to high blood pressure?

Correct Answer
verified

Correct Answer
verified

A woman has been standing in one place without moving for a long time. You walk by and notice that her ankles are swollen. What is a likely explanation for this observation?

Correct Answer
verified

The diameter of a capillary is about the same as that of

Correct Answer
verified

Blood flow through capillaries is controlled by

Correct Answer
verified

Exam 23: Circulation

Stem cells found in the red marrow inside bones

Correct AnswerverifiedShow Answer

During exercise, your cardiac output can increase dramatically in order to meet the metabolic demands of your tissues. If your heart rate increased to 150 beats per minute and the volume of blood pumped per beat is 75 mL, what is your cardiac output?

Correct AnswerverifiedShow Answer

Cardiac output is defined as the volume of blood pumped by a(n) ________ each time it contracts.

Correct AnswerverifiedShow Answer

The location of the heart's pacemaker is a specialized region of cardiac muscle called the

Correct AnswerverifiedShow Answer

In mammals, which of the following vessels transports oxygenated blood from the lung back to the heart?

Correct AnswerverifiedShow Answer

An adult human's red blood cells are formed in the

Correct AnswerverifiedShow Answer

Which of the following factors contributes to the flow of blood in veins?

Correct AnswerverifiedShow Answer

Blood clots are formed by platelets and the plasma protein

Correct AnswerverifiedShow Answer

Using a stethoscope, you listen to a beating heart and hear "lub-dup, lub-dup." These sounds are created by

Correct AnswerverifiedShow Answer

During which phase of the heartbeat does the heart fill with blood?

Correct AnswerverifiedShow Answer

Which of the following statements regarding blood pressure is false?

Correct AnswerverifiedShow Answer

During ventricular systole, the ________ valves ________.

Correct AnswerverifiedShow Answer

At any given time, what percentage of the body's capillaries have blood flowing through them?

Correct AnswerverifiedShow Answer

Myocardial infarction, also called a heart attack,

Correct AnswerverifiedShow Answer

Which of the following statements regarding circulatory systems is true?

Correct AnswerverifiedShow Answer

Which of the following can contribute to high blood pressure?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A woman has been standing in one place without moving for a long time. You walk by and notice that her ankles are swollen. What is a likely explanation for this observation?

Correct AnswerverifiedShow Answer

The diameter of a capillary is about the same as that of

Correct AnswerverifiedShow Answer

Blood flow through capillaries is controlled by

Correct AnswerverifiedShow Answer

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During ventricular systole, the valves .

Correct Answer
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