The two primary factors that influence the speed of an action potential propagation are
a. axon diameter and myelination.
b. the type of associated glial cell(s).
c. concentration of K+ in the cell.
d. the length of the axon.
a. axon diameter and myelination.
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Perturbing solutes include all of the following EXCEPT
A) Na+. B) K+. C) Charged amino acids. D) Trehalose.
Select the correct statement about the physical factors influencing pulmonary ventilation
A) Surfactant helps increase alveolar surface tension. B) A lung that is less elastic will require less muscle action to perform adequate ventilation. C) A decrease in compliance causes an increase in ventilation. D) As alveolar surface tension increases, additional muscle action will be required.
The most inferior portion of the sternum is called the
A) manubrium. B) sternal groove. C) body. D) xiphoid process. E) sternal angle.
Which of the following is true of an artery?
A) It has a relatively thick media. B) The histological structure permits a two-way exchange of substances between the blood and body cells. C) The vessel walls are relatively thin. D) Blood flow is the slowest of all classes of vessels. E) All of the answers are correct.