Biology: The Unity and Diversity of Life (MindTap Course List)
14th Edition
ISBN: 9781305073951
Author: Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher: Cengage Learning
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Chapter 34, Problem 3DAA
Sperm Counts Down on the Farm Contamination of water by agricultural chemicals affects reproductive function in some animals. Are there effects on humans? Epidemiologist Shanna Swan and her colleagues studied sperm from men in four cities in the United States (FIGURE 34. 22). The men were partners of women who had become pregnant and were visiting a prenatal clinic, so all were fertile. Of the four cities, Columbia, Missouri, is located in the county with the most farmlands. New York City in New York is in an area with no agriculture.
| Location of Clinic | ||||
| Columbia, Missouri | Los Angeles, California | Minneapolis, Minnesota | New York, New York | |
| Average age | 30.7 | 29.8 | 32.2 | 36.1 |
| Percent nonsmokers | 79.5 | 70.5 | 85.8 | 81.6 |
| Percent with history of STD | 11.4 | 12.9 | 13.6 | 15.8 |
| Sperm count (million/ml) | 58.7 | 80.8 | 98.6 | 102.9 |
| Percent motile sperm | 48.2 | 54.5 | 52.1 | 56.4 |
FIGURE 34.22 Characteristics men h four cities. All men were partners of woman who visited prenatal health clinics, and so were presumably fertile. STD stands for sexually transmitted disease.
Aging, smoking, and sexually transmitted diseases adversely affect sperm. Could differences in any of these variables explain the regional differences in sperm count?
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Chapter 34 Solutions
Biology: The Unity and Diversity of Life (MindTap Course List)
Ch. 34 - Prob. 1DAACh. 34 - Sperm Counts Down on the Farm Contamination of...Ch. 34 - Sperm Counts Down on the Farm Contamination of...Ch. 34 - Sperm Counts Down on the Farm Contamination of...Ch. 34 - __________are signaling molecules that travel...Ch. 34 - A __________ is synthesized from amino acids and...Ch. 34 - Match each pituitary hormone with its target....Ch. 34 - Releasing hormones secreted by the hypothalamus...Ch. 34 - In adults, too much __________ can cause...Ch. 34 - Function of the __________ declines after puberty....
Ch. 34 - Low blood calcium triggers secretion by ________....Ch. 34 - _______ lowers blood sugar levels; ________ raises...Ch. 34 - Prob. 9SQCh. 34 - Secretion of _______ suppresses immune responses....Ch. 34 - Exposure to bright light lowers blood _________...Ch. 34 - Prob. 12SQCh. 34 - True or false? Only women make...Ch. 34 - Prob. 14SQCh. 34 - Prob. 15SQCh. 34 - Women who have been blind since birth almost never...Ch. 34 - A diabetic who injects too much insulin can lose...
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