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

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

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

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

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Cell Signalling and Transduction
Self-phosphorylation is an excellent mechanism for triggering specific catalytic function of the proteins involved in signal cascades because it

allows hydrophilic signaling molecules to cross the plasma membrane
changes the shape and thus the enzymatic activity of the proteins involved
makes the receptor more likely to capture the signaling, molecule
None of these

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Cell Signalling and Transduction
If a disease of the blood vessels caused the endothelial cells of the vessel to die, what effect would that have on the cellular activities associated with vasodilation?

All of these
Smooth muscle cells could not be made to relax
Nitric oxide would no longer be produced
It would be more difficult to increase blood flow and reduce blood pressure

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