Why are bacteria not found in the small intestine?
The small intestine contains microvilli that optimize absorption of nutrients. These cells are very delicate and would be easily destroyed by bacteria. If bacteria adhere to the cells of the small intestine, they would interfere with both final digestion of nutrients as well as the absorption of nutrients into the blood.
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Teratogens are substances that:
1.affect only the early stages of pregnancy. 2.affect only the later stages of pregnancy. 3.are required for normal fetal growth. 4.disrupt normal cell growth and development.
Longevity is defined as
a. long duration of life. b. a person's age in years from date of birth. c. maximum number of years of life attainable by a species. d. average number of years lived by people in a given society.
Very high intakes of pantothenic acid can cause _____
A) increased plasma glucose B) concussion and hemorrhage C) burning feet sensation D) nausea and diarrhea
What gland responds to a lack of water in the body by releasing a hormone?
a. Pineal b. Hypothyroid c. Pituitary d. Thyroid