Myelin speeds the conduction of action potentials along a neuron by
A) lowering the threshold at which action potentials are generated.
B) allowing the action potential to "jump" over sections of the axon.
C) inserting additional voltage-gated K+ channels into the membrane.
D) increasing the resting membrane potential.
E) increasing the diameter of the axon.
B
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a. are proteins. b. include testosterone, estrogens, and cortisol. c. never activate second messengers. d. never alter membrane transport of ions. e. are large nonpolar molecules.
Which of the following fungi form
mushrooms?
a. club fungi b. sac fungi c. zygote fungi d. yeast fungi e. more than one of these
The use of plants to clean up environmental contaminants is called ____
a. photosynthesis b. phototropism c. translocation d. phytoremediation e. transpiration
Which of the following best defines the term pathology?
A) the scientific study of diseases B) the invasion and colonization of a host by a microorganism C) Pathogenesis D) etiology