Which of the following is an example of the prevention of cellular signaling?

A. The nicotine in cigarette smoke binds to
and activates the acetylcholine receptor in
plasma membranes of neurons in the brain.
B. Proteins on the surface of cells in taste
buds called umami receptors bind to
glutamates and nucleotides in food which
changes the membrane potential of these
cells and tells the brain, "This is savory."
C. Allergy medicines called antihistamines
bind to and block histamine receptors to keep
fluids in capillaries that would normally be
released and cause stuffy noses and watery
eyes.


C

Biology & Microbiology

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