Endocrine disruptors are environmental chemicals, which, if people and other animals are exposed, can have hormone-mimicking or hormone -blocking effects. These chemicals are used in industries and in homes and are associated with such commonly used products as pesticides and herbicides, plastic food containers and baby bottles. Those that mimic or block sex steroids are of special concern,
because they are present in household plastics and are fat-soluble, thus easily stored in fatty tissue of the body and can affect a developing fetus. Research is ongoing and results are controversial, but these chemicals have been associated with:
What will be an ideal response?
A. Blocked estrogen and androgen;
B. blocked testosterone or mimicked estrogen;
C. blocked testosterone or mimicked estrogen;
D. blocked estrogen or prolactin;
E. blocked testosterone; and
F. mimicked estrogen.
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How many cells does the human body have?
A. 100 million B. 25 trillion C. 4 billion D. 75 trillion
Water may move through membrane pores constructed by transmembrane proteins called ________.
Fill in the blank(s) with the appropriate word(s).
Veins are defined as blood vessels that
a. carry deoxygenated blood. b. connect multiple capillary beds. c. function in returning blood to the heart. d. carry oxygenated blood. e. function in carrying blood away from the heart.
The synthesis of __________ depends on the penetration of ultraviolet light through the epidermis.
A. collagen B. keratin C. cholesterol D. carotene E. vitamin D