Cell Signalling and Transduction
In vasodilation, proper nerve signals sent to blood vessels cause

reduced blood pressure
All of these
the release of nitric oxide from endothelial cells
relaxation of smooth muscle cells

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Cell Signalling and Transduction
cAMP and cGMP are derived from

ATP and GTP by the actions of guanylate cyclase and adenylate cyclase respectively
ATP and GTP by the actions of adenylate cyclase and guanylate cyclase respectively
None of these
GTP and ATP by the actions of adenylate cyclase and guanylate cyclase respectively

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

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

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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
two distinct types based on the distance over which the signaling molecules act
three distinct types based on the distance over which the signaling molecules act

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Cell Signalling and Transduction
The binding of ligands to many G-proteins linked receptors leads to shortlived

increase in the concentration of certain intracellular signaling molecules called second messenger
decrease in the concentration of certain intracellular signaling molecules called second messenger
decrease in the concentration of certain extracellular signaling molecules called first messenger
increase in the concentration of certain extracellular signaling molecules called first messenger

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