EBK CAMPBELL BIOLOGY IN FOCUS
2nd Edition
ISBN: 8220101459299
Author: Reece
Publisher: PEARSON
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Chapter 33, Problem 9TYU
FOCUS ON EVOLUTION
The human esophagus and trachea share a passage leading from the mouth and nasal passages, which can cause problems. After reviewing vertebrate evolution (see Concept 21.4), explain how descent with modification explains this “imperfect” anatomy.
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Human anatomy is rather good, thanks to evolution. However, can you think of ways to improve it? For example, allow females to have four breasts instead of two - useful for breastfeeding multiple births. Append an extra pair of arms - useful for carrying things and performing tasks. Have an intake port for food that is separate from the orifice used for talking/breathing - we could eat and talk at the same time and be less likely to choke on our food. Add an extra eye - perhaps in the back of our head? Add a third kidney. Have a way to store oxygen for the brain so that we can withstand interruption to breathing for longer. Have a blood supply to the myocardium that has more anastomoses so that blood can navigate around blockages to the coronary arteries. A wider or more elastic birth canal so that birth can be accomplished more rapidly and with less drama. Eliminate the appendix. Have the ability to digest cellulose, etc. (Do not consider the imaginary powers of "superheroes".)…
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Chapter 33 Solutions
EBK CAMPBELL BIOLOGY IN FOCUS
Ch. 33.1 - An animal requires 20 amino acids to make...Ch. 33.1 - Prob. 2CCCh. 33.1 - WHAT IF? if a zoo animal eating ample food shows...Ch. 33.2 - Prob. 1CCCh. 33.2 - In what sense are nutrients from a recently...Ch. 33.2 - Prob. 3CCCh. 33.3 - How does swallowed food reach the stomach of a...Ch. 33.3 - Explain why a proton pump inhibitor, such as the...Ch. 33.3 - Prob. 3CCCh. 33.4 - Prob. 1CC
Ch. 33.4 - Prob. 2CCCh. 33.4 - Prob. 3CCCh. 33.5 - Prob. 1CCCh. 33.5 - The energy required to maintain each gram of body...Ch. 33.5 - Prob. 3CCCh. 33 - The mammalian trachea and esophagus both connect...Ch. 33 - Which organ is incorrectly paired with its...Ch. 33 - Which of the following is not a major activity of...Ch. 33 - Prob. 4TYUCh. 33 - Prob. 5TYUCh. 33 - If you were to jog 1 km a few hours after lunch,...Ch. 33 - Prob. 7TYUCh. 33 - Prob. 8TYUCh. 33 - FOCUS ON EVOLUTION The human esophagus and trachea...Ch. 33 - Prob. 10TYUCh. 33 - Prob. 11TYU
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