Step-by-step explanation:
- Tyrosine is modified by tyrosine hydroxylase to form DOPA.
- Oxytocin binds to oxytocin receptors in the uterine myometrium, which triggers the G-protein coupled receptor signal transduction cascade that causes increased intracellular calcium concentrations.
- Serotonin is a result of tryptophan, a component of proteins, combining with tryptophan hydroxylase, a chemical reactor.