Question 1
Which second messenger is stimulated by epinephrine binding to a β-adrenergic receptor?
◦ Calcium
◦ Inositol triphosphate (IP
3)
◦ Diacylglycerol (DAG)
◦ Cyclic adenosine monophosphate (cAMP)
Question 2
Why is the control of calcium in cells important?
◦ It is controlled by the calcium negative-feedback loop.
◦ It is continuously synthesized.
◦ It acts as a second messenger.
◦ It carries lipid-soluble hormones in the bloodstream.