Biology
11th Edition
ISBN: 9781259188138
Author: Peter H Raven, George B Johnson Professor, Kenneth A. Mason Dr. Ph.D., Jonathan Losos Dr., Susan Singer
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 49, Problem 3A
The difference between the amphibian and mammal hearts is that
a. in the amphibian heart, oxygenated and deoxygenated blood mix completely in the single ventricle.
b. in the amphibian heart, there are two SA nodes so that contractions occur simultaneously throughout the heart.
c. in the ventricle in the amphibian heart, internal channels reduce mixing of blood.
d. in the amphibian heart, only the left aorta pumps oxygen obtained by diffusion through the skin.
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The difference between the amphibian and mammal hearts is thata. in the amphibian heart, oxygenated and deoxygenated blood mix completely in the single ventricle.b. in the amphibian heart, there are two SA nodes so that contractions occur simultaneously throughout the heart.c. in the ventricle in the amphibian heart, internal channels reduce mixing of blood.d. in the amphibian heart, only the left aorta pumps oxygen obtained by diffusion through the skin
Which of the following is true of the circulatory system of a grasshopper?
A. One or more muscular chamber hearts drive blood through the closed circulatory system of the
grasshopper.
B. The grasshopper has an open circulatory system with a heart that is a peristaltic vessel.
C. Because the grasshopper has an open circulatory system, the maximum hemolymph pressures
that can be achieved are relatively low, which limits the maximum metabolic rate that can be
achieved.
D. The grasshopper does not have a specialized circulatory system - instead, its circulatory system
consists of the fluid in the body cavity which is circulated by means of the body movements of
the animal.
E. Both B and C are true of the circulatory system of the grasshopper.
Which of the following is a predicted outcome in a mammal heart that entirely lacks valves?
A.
Oxygenated and spent (deoxygenated) blood would mix.
B.
Cardiac output would be lower than that in a normal heart with valves.
C.
Heart rate would be lower compared with that in a normal heart with valves.
D.
A-V delay would be longer compared with that in a normal heart with valves.
E.
The pathways for blood flow to the body and the lungs would be reversed.
Chapter 49 Solutions
Biology
Ch. 49 - An ECG measures a. changes in electrical potential...Ch. 49 - Systole is vitally important to heart function and...Ch. 49 - Which of the following is the correct sequence of...Ch. 49 - Which of the following statements is not true? a....Ch. 49 - Prob. 5UCh. 49 - Prob. 6UCh. 49 - When a sphygmomanometer is used, a. blood pulses...Ch. 49 - Prob. 8UCh. 49 - In vertebrate hearts, atria contract from the top,...Ch. 49 - Prob. 2A
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