Which of the following statements best describes the mechanism of action of insulin on target cells?
AInsulin binds to a receptor on the outer surface of the plasma membrane, activating adenylate cyclase through the Gs protein.
BInsulin binds to a cytoplasmic receptor and is transferred as a hormone receptor complex to the nucleus to modulate gene expression.
CInsulin enters the cell and causes the release of calcium ions from intracellular stores.
DInsulin binds to a transmembrane receptor on the outer surface of the plasma membrane, activating the tyrosine kinase in the cytosolic domain of the receptor.
All the following hormones have receptors on the plasma membrane of target tissues except:
AEpinephrine
BGlucagon
CEstradiol
DThyrotropin
A primigravida at 38 weeks of gestation has gone into labor. Oxytocin was started to augment labor. The second messenger system through which oxytocin acts is:
ATyrosine kinase
BPhospholipase C (IP3/DAG pathway)
CcGMP
DcAMP
+ 7 more in the PDF
Browse all chapters