The chemoreceptors in the carotid and aortic bodies are most sensitive to changes in blood concentration of
A. bicarbonate ions.
B. oxygen.
C. hydrogen ions.
D. carbon dioxide.
Answer: B
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Nitrogen atoms can form a maximum of four covalent bonds with other atoms.
Answer the following statement true (T) or false (F)
Match the appropriate characteristic with the type of immunity.A. Innate immunityB. Antibody-mediated immunityC. Cell-mediated immunityD. Both antibody-mediated and cell-mediated immunityE. Innate immunity, antibody-mediated immunity, and cell-mediated immunityTears and saliva
Fill in the blank(s) with the appropriate word(s).
A deficiency of hormone results in an increase in the number of receptors for that hormone. This is known as _____ and results in _____.
A) Negative feedback. Increased response to the hormone. B) Down-regulation. Decreased sensitivity to the hormone. C) Positive feedback. Decreased response to the hormone. D) Up-regulation. Increased sensitivity to the hormone.
Vesicles and glycoproteins required at the synapse are moved down a nerve fiber by ________ axonal transport.
A. slow B. fast