The drugs that enter the human tend to stimulate certain receptors, ion channels, act on enzymes or transporter proteins.

The patients respond abnormally to a drug that stimulates certain receptors for serotonin.

Carbachol is a parasympathomimetic that stimulates both muscarinic and nicotinic receptors.

It selectively stimulates receptors in the brain that monitor catecholamine levels in the blood.

When the smell is breathed in through the nose, it stimulates sensory receptors.

We see movement because such displays stimulate receptors (called Reichardt detectors) in our brains that encode movement.

It indirectly stimulates both nicotinic and muscarinic receptors.

There, Lynch believes, the neurotransmitter stimulates special receptors (red pegs) that in turn open up calcium channels on the spine.

Together these might indicate that saccharin stimulates both sweet and bitter receptors but that the affinity to T2Rs is much lower.

The increased amounts of histamine released from histaminergic nerve endings can stimulate receptors.