John Snow’s work with cholera cases laid the foundation for the science now known as ________, which investigates the occurrence, spread, and distribution of human disease
immunology
chemotherapy
epidemiology
parasitology
epidemiology
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The drug mifepristone (RU-486) is a contraceptive that
a. blocks passage of sperm through the male reproductive tract. b. blocks passage of sperm through the female reproductive tract. c. prevents ovulation. d. causes shedding of the endometrial lining and the implanted embryo by initiating a menstrual period. e. prevents implantation by blocking estrogen receptors in the uterus.
Glaucoma is most often an age-related, painless, and chronic disease, with slowly developing symptoms.
a. true b. false
You have isolated a cell that is unable to produce cholesterol for its cell membranes. Which of the following defects is this cell most likely to have?
A) The cell will not be able to regulate the transportation of substances into and out of the cell. B) The cell will burst as a result of osmosis. C) The cell will be unable to transport nutrients. D) The cell will not be able to communicate with other cells. E) The cell membrane will not have the correct fluidity.
Which statement best describes how one neuron stimulates another?
A) The neurons are physically connected, so the action potential continues movement. B) Calcium ions diffuse across the synapse. C) Neurotransmitter molecules diffuse across the synapse. D) Sodium ions jump across to the next neuron's membrane.