| At this average receptor density, if all the particles are homogeneous, there are too few receptors on any particle to support any adhesion. |
| Disparate methods for defining force and torque balances and for calculating the mass balance of receptors therefore result. |
| Sometimes both the enantiomers of a racemate are biologically active but act at different receptors and cause different effects. |
| The saturation of receptors at a single central synapse by a quantum of neurotransmitter is the subject of much controversy. |
| The best known of these are atrial receptors, which are nerves ending mainly at the junctions of the great veins with the atria. |
| The action of a common neurotransmitter, such as acetylcholine, illustrates how ion channel receptors work. |
