Which of the following does the central nervous system use for the action of pulling your hand away from a hot object?
A) sensory neurons B) receptors C) glial cells D) motor neurons
Answer: D
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The electrical stimulus for each human heartbeat begins in the ____ at the _____ node.
A. right atrium, sinoatrial. B. left atrium, sinoatrial. C. right atrium, atrioventricular. D. right ventricle, atrioventricular. E. pulmonary trunk, sinoatrial.
You are studying a gene which, when mutant, causes oligodendrocytes to enwrap shorter sections of axon, so that nodes of Ranvier are more closely spaced. What is the likely effect on nerve impulses?
Nodes of Ranvier are the spaces between sections of axon enwrapped with myelin. Because myelin creates an insulating layer that prevents ion flow, the progress of the action potential "jumps" from node to node, thus speeding up transmission down the axon. A. They will travel faster. B. They will travel slower. C. They will increase in amplitude. D. They will decrease in amplitude. E. They will travel laterally across connected axons. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain? Gather Content/Choose Answer · What do you already know about nodes of Ranvier? How do they relate to nerve impulses? Consider Alternatives · What other information is related to the question? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
A cell contains 10% solute, while the external environment contains 20% solute. What kind of solution is this cell sitting in?
a. hypotonic b. isotonic c. hypertonic d. osmotonic
The amniotic egg of reptiles, birds, and mammals is an adaptation to
a. thwart carnivorous predators. b. allow life on land. c. compensate for the short period of development of the young. d. protect the young from the nitrogenous wastes of the mother during embryonic development.