In resting individuals, which vessels serve as a large blood reservoir from which blood can be quickly diverted to other vessels as needed?
a) Arteries and arterioles
b) Arterioles and capillaries
c) Venules and capillaries
d) Veins and venules
e) Aorta and veins
d
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Conduction by local current flow
a. occurs in unmyelinated fibers. b. is faster than propagation of an action potential in myelinated fibers because myelin acts as an insulator to slow down the impulse. c. involves current flowing locally between the active and adjacent inactive areas, thereby bringing the inactive areas to threshold so that they too become active (i.e., have an action potential). d. both (a) and (c) above. e. all of these answers.
What cells within the alveoli are capable of phagocytosis and can therefore engulf particulate matter that might reach the alveoli?
a. alveolar macrophage b. alveolar septal cells c. alveolar NK cells d. alveolar plasma cells
Which of the following is NOT a disaccharide?
A. Maltose B. Sucrose C. Fructose D. Lactose
Which of the following is unique to atoms of each element?
A. The number of electrons B. The ratio of protons to electrons C. The number of neutrons D. The number of bonds it can form E. The number of protons