Naloxone blocks post-synaptic receptors sensitive to the endogenous neurotransmitters

Naloxone blocks post-synaptic receptors sensitive to the endogenous neurotransmitters called endorphins.
Group of answer choices

The binding of endorphin molecules to their post-synaptic receptors leads to pain reduction targeted to specific body areas.

Naloxone reduces the effects of heroin by blocking the post-synaptic receptor sites impacted by heroin molecules and so is useful in treating a heroin overdose.

Naloxone diminishes the reduction in pain caused by release of endorphins.

More than one of the listed answers is correct