Final answer:
Delta receptors do not mediate respiratory depression and miosis, which are effects more commonly associated with the activation of mu opioid receptors. Delta receptors are linked with analgesic effects and mood modulation, but not these particular adverse effects.
Step-by-step explanation:
The question pertains to the pharmacological effects mediated by delta receptors, which are one of the opioid receptor subtypes. While opioid receptors are known to be involved in several physiological effects due to their activation, the delta receptors specifically are not primarily responsible for certain actions.
The correct answer to which two effects delta receptors do not mediate is d) Respiratory depression and miosis. Analgesia, which is the reduction of pain without loss of consciousness, is indeed a result of delta receptor activation, as well as other opioid receptors like mu and kappa. However, miosis (excessive constriction of the pupil) and respiratory depression (a decrease in the urge to breathe) are more commonly associated with the activation of mu receptors, not delta receptors. Delta receptors are linked to some analgesic effects and can play a role in modulating mood and emotional responses, but they do not typically mediate the clinically significant respiratory depression or miosis that is often observed with opioid use.