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

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

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Cell Signalling and Transduction
In the signal transduction mechanism known as protein phosphorylation

receptor kinases play a key role in triggering the signal cascade
the signaling molecule binds to a surface receptor
All of these
phosphorylated proteins act with enzymes to trigger the signal cascade

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