Campbell Biology: Concepts and Connections
10th Edition
ISBN: 9780135269169
Author: Taylor
Publisher: PEARSON
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Chapter 23, Problem 17TYK
Physiologists speculate about cardiovascular adaptations in dinosaurs—some of which had necks almost 10 m (33 feet) long. Such animals would have required a systolic pressure of nearly 760 mm Hg to pump blood to the brain when the head was fully raised. Some analyses suggest that dinosaurs’ hearts were not powerful enough to generate such pressures, leading to the speculation that long-necked dinosaurs fed close to the ground rather than raising their heads to feed on high foliage. Scientists also debate whether dinosaurs had a “reptile-like” or “bird-like” heart. Most modern reptiles have a three-chambered heart with just one ventricle. Birds, which evolved from a lineage of dinosaurs, have a four-chambered heart. Some scientists believe that the circulatory needs of these long-necked dinosaurs provide evidence that dinosaurs must have had a four-chambered heart. Why might they conclude this?
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Students have asked these similar questions
Which of the following statements about vertebrate circulatory systems is not true?
A.
In mammals, the blood pressure in the aorta is higher than the pressure in the pulmonary artery.
B.
In fishes, oxygenated blood from the gills returns directly to the heart through the left atrium.
C.
In birds, deoxygenated blood leaves the heart through the pulmonary artery.
D.
In reptiles, the blood in the pulmonary artery has a lower oxygen content than the blood in the aorta.
E.
In amphibians, deoxygenated blood enters the heart through the right atrium.
Which of the following is true of the circulatory system of a grasshopper?
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C. Because the grasshopper has an open circulatory system, the maximum hemolymph pressures
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Chapter 23 Solutions
Campbell Biology: Concepts and Connections
Ch. 23 - Connecting the Concepts 1. Use the following...Ch. 23 - Prob. 2TYKCh. 23 - When the doctor listened to Janets heart, he heard...Ch. 23 - Prob. 4TYKCh. 23 - Prob. 5TYKCh. 23 - Prob. 6TYKCh. 23 - Blood flows more slowly in the arterioles than in...Ch. 23 - Which of the following is not a true statement...Ch. 23 - Trace the path of blood starting in a pulmonary...Ch. 23 - Prob. 10TYK
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