The difference in hormone effects on two different tissues is due to
A)receptor molecules on the hormone molecule. B)receptor molecules on the target cell. C)presence of a second messenger. D)presence of a compatible gene.
A)negative feedback systems similar to a house thermostat. B)positive feedback systems that require a shut-off mechanism. C)input from the nervous system. D)response to input of hormones and metabolites. E)All of the choices control hormone levels.