The principal ions in extracellular fluid are sodium, chloride, and
A) potassium.
B) magnesium.
C) phosphate.
D) bicarbonate.
E) iodine.
D
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Foreign particles that are not filtered out by the respiratory epithelium are
A. carried away in blood. B. collected by lymph nodes. C. stored in nearby pulmonary alcoves. D. coughed up during normal daily activities. E. dissolved by enzymes in the alveoli.
Describe the differences between positive and negative feedback systems
What will be an ideal answer?
Where are the anterior and posterior communicating arteries found?
A. The neck B. The cerebral arterial circle (circle of Willis) C. The branches of the celiac trunk D. The forearm E. The azygos-hemiazygos system
The embryonic feature that gives rise to the anterior and lateral horns of gray matter is the ________ plate.
A. basal B. alar C. posterior D. anterior E. ulnar