Which of the following might trigger erythropoiesis?
A) an increased number of RBCs
B) decreased tissue demand for oxygen
C) hypoxia of EPO-producing cells
D) moving to a lower altitude
C
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The palatine tonsils lie in the walls of the
A) nasopharynx. B) oropharynx. C) laryngopharynx. D) larynx. E) nasal cavity.
One method by which cytotoxic T cells destroy their target cells is by releasing substances that
A) increase protein production. B) enhance ribosomal activities. C) suppress the antigen recognition process. D) rupture cell membranes. E) produce memory T cells.
The arteries
a. serve as rapid-transit passageways from the heart because of their large radii b. act as a blood reservoir because they have the capacity to store large volumes of blood with little change in their internal pressure c. are the major sites of blood flow resistance in the vasculature d. are the site of exchange between the blood and surrounding tissues e. always carry oxygenated blood
An atom with 5 protons, 5 neutrons, and 6 electrons would have a net charge of ________.
A. +1 B. +2 C. -2 D. -1