When you step on a nail, pain receptors send action potentials via ________ neurons to the spinal cord, where they synapse with __________ neurons which in turn synapse with _______ neurons which send action potentials to _________.
Fill in the blank(s) with the appropriate word(s).
Answer: afferent; multiple interneurons; efferent; multiple leg muscles
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A high school student in Nepal is accepted—and eventually attends—college in the United States. His diet goes from one that is rich in vegetables and grains to one that primarily consists of meat and sugars
What will happen to the bacterial composition of his intestines? A. There will be more Firmicutes inhabiting his intestinal tract. B. There will be more Bacteroidetes inhabiting his intestinal tract. C. Nothing will happen; there is no relationship between bacteria in the intestines and diet. D. Bacteria will no longer inhabit his intestines.
How does a signal molecule bring about specific changes in the cell to which it binds?
What will be an ideal response?
All of the following apply to the deep sea except:
a. temperatures vary greatly in deep waters. b. pressures are very high. c. light is dim or nonexistent. d. the water is extremely cold.
The scientific method ________
A) is a rigid methodology that must be precisely followed to ensure validity B) is a rough recipe for answering questions, but the steps need not be performed in the same order as outlined C) is undertaken only by trained scientists in a controlled laboratory setting D) is the means by which absolute truth can be uncovered