Seniors age 65 and older should get at least 2.5 hours of moderate aerobic exercise (such as brisk walking) every week. That averages out to about 30 minutes on most days of the week. Or you should get 1 hour and 15 minutes of vigorous exercise (such as jogging) each week.
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Harmful mutations may cause genetic disorders or cancer. A genetic disorder is a disease caused by a mutation in one or a few genes. A human example is cystic fibrosis. A mutation in a single gene causes the body to produce thick, sticky mucus that clogs the lungs and blocks ducts in digestive organs.
Mutations arise spontaneously at low frequency owing to the chemical instability of purine and pyrimidine bases and to errors during DNA replication. Natural exposure of an organism to certain environmental factors, such as ultraviolet light and chemical carcinogens (e.g., aflatoxin B1), also can cause mutations.
only a small percentage of mutations cause genetic disorders—most have no impact on health or development. For example, some mutations alter a gene's DNA sequence but do not change the function of the protein made by the gene.
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the branch of public health concerned with monitoring or mitigating those factors in the environment that affect human health and disease
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pertaining to or characteristic of a man or men: masculine attire. having qualities traditionally ascribed to men, as strength and boldness.
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