Cell Signalling and Transduction
Nitroglycerin has long been administered to human patients suffering from chronic chest pain (angina). This medication works because it

interferes with chemical cascades that trigger contraction of heart muscle
mimics the action of signal receptors
breaks down into nitric oxide, which increases blood flow to the heart
is broken down into hormones that affect the heart

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Cell Signalling and Transduction
Cell signaling can be classified into

three distinct types based on the signaling molecules
None of these
three distinct types based on the distance over which the signaling molecules act
two distinct types based on the distance over which the signaling molecules act

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