What is measured by the machine that Augustus Waller invented?
a. blood pressure when the ventricles are contracting
b. cardiac output
c. electrical activity of the heart
d. blood pressure when the ventricles are relaxed
Ans: c. electrical activity of the heart
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Which of the following statements is false?
a. The information that travels along the neural membrane is little more than a transient change in the membrane potential. b. A neuron is never really at rest but must expend energy to keep the membrane potential constant even when no impulse is being transmitted. c. During the short time an action potential occurs, the cytoplasmic side of the membrane becomes positive with respect to the outside. d. Only nerve cells can exhibit depolarization events. e. Action potentials are not directly transferred from neuron to neuron.
The taxonomic rank that includes orders but not phyla is:
a) kingdom. b) domain. c) genus. d) class. e) family.
Germ-free animals are often more susceptible to infections and serious disease than are animals with a typical complement of normal microbiota. Based on this observation, which of the following would be an appropriate conclusion?
A. Normal microbiota are incapable of causing disease B. Normal microbiota stimulate the development of the immune system C. Normal microbiota are parasitic D. Normal microbiota are opportunists E. Normal microbiota provide supplemental nutrition to the host
Familial hypercholesterolemia is a(n) _______ disorder.
Fill in the blank(s) with the appropriate word(s).