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Biology

Eric P. Widmaier; Linda E. Graham; Robert J. Brooker

Chapter 47

Circulatory Systems - all with Video Answers

Educators

Chapter Questions

04:57

Problem 1

Hemolymph differs from blood in that it
a. does not contain blood cells.
b. is a mixture of fluid in blood vessels and the hemocoel.
c. circulates through closed circulatory systems only.
d. functions only in defense of the body and not transport.
e. does not pass through a heart.

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01:45

Problem 2

The heart chamber that receives oxygenated blood from the lungs of animals with a double circulation is the
a. left atrium.
b. right ventricle.
c. left ventricle.
d. right atrium.

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02:26

Problem 3

A typical hematocrit for a human is around $42 \% .$ This value
means that
a. the typical fluid portion of blood is about $42 \%$ of the blood volume.
b. leukocytes make up $42 \%$ of the blood volume.
c. erythrocytes make up $42 \%$ of the blood volume.
d. leukocytes and erythrocytes together make up $58 \%$ of the blood volume.
e. erythrocytes alone make up $58 \%$ of the blood volume.

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Ummatul Choudary
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02:26

Problem 4

A major advantage of a double circulation is that
a. blood can be pumped to the upper portions of the body by one circuit and to the lower portions of the body by the other circuit.
b. each circuit can pump blood at a different pressure to optimize the function of each.
c. the oxygenated blood can mix with the deoxygenated blood before being pumped to the tissues of the body.
d. less energy is required to provide nutrients and oxygen to the tissues of the body.
e. All of the above are advantages of a double circulation.

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03:45

Problem 5

The function of erythrocytes is to
a. transport oxygen throughout the body.
b. defend the body against infection and disease.
c. transport chemical signals throughout the body.
d. secrete the proteins that form blood clots.
e. Both a and d are functions of erythrocytes.

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02:17

Problem 6

What would happen to an animal's blood pressure if its cardiac output increased by a factor of 2 and its total peripheral resistance decreased by $50 \% ?$
a. Blood pressure would decrease 16 -fold.
b. Blood pressure would increase 8 -fold.
c. Blood pressure would increase 1.5 -fold.
d. Blood pressure would increase 24 -fold.
e. Blood pressure would not change.

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02:42

Problem 7

During systole of the cardiac cycle, the
a. ventricles of the heart are both relaxed.
b. ventricles of the heart are both filling.
c. ventricles of the heart are both contracting.
d. right ventricle is contracting while the left ventricle is at rest.
e. left ventricle is contracting while the right ventricle is at rest.

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02:13

Problem 8

Considering blood flow through a closed circulation, which is the correct sequence of vessels, beginning at the heart?
a. arteriole, artery, capillary, vein, venule
b. artery, capillary, arteriole, venule, vein
c. vein, venule, capillary, arteriole, artery
d. artery, arteriole, capillary, venule, vein
e. artery, arteriole, capillary, vein, venule

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02:00

Problem 9

Gas and nutrient exchange between the circulation and the tissues occurs primarily at the
a. arteries.
b. arterioles.
c. capillaries.
d. venules.
e. veins.

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02:08

Problem 10

Which of the following factors determines arterial blood pressure?
a. cardiac output
b. resistance
c. arteriole diameter
d. $a, b,$ and $c$
e. a and b only

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