Chemoreceptors respond to chemical stimuli such as the molecules which give taste and smell. The chemicals are dissolved in fluids and for aquatic animals, taste and smell are the same. The thermoreceptors respond to temperature changes.
Chemoreceptors, aortic and carotid bodies, are located in the aorta and carotid arteries
Primarily monitor pH and CO2 level (homeostasis control) ...
Mechanoreceptors
Chemoreceptors
Photoreceptors
These whiplike appendages extend from the surface of many types of eukaryotic cells.
Chemoreceptors: smell and taste mainly, as well as internal sensors in the digestive and circulatory systems.
Thermoreceptors: changes in temperature.
Electroreceptors: detect electrical currents in the surrounding environment.
Information outflow (i.e. from dendrites to other neurons) can also occur, but not across chemical synapses; there, the backflow of a nerve impulse is inhibited by the fact that an axon does not possess chemoreceptors and dendrites cannot secrete ...
 See also: Neuron, Receptor, Molecule, Membrane, Cells
  
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