There are two types, rods for black and white, and cones for colors.
Cones
No, they are entirely two different things. What might stimulate a receptor could be an antigen.
neurotransmitter
Within the nasal cavity, odorant molecules interact with the cilia on odorant receptor cells. The binding of odorant molecules onto receptor proteins causes a net change in the membrane permeability of the receptor cells which then causes an action potential to be generated by the receptor cell. Unlike other senses, olfaction is not redirected by the Thalmus. It instead goes directly from the afferent receptor cells to the olfactory bulb. From the olfactory bulb, the action potential is sent directly to the cerebral cortex, specifically the limbic system (this is why there is a large emotional association with smell).
a receptor
Cones
receptor molecules
No, they are entirely two different things. What might stimulate a receptor could be an antigen.
neurotransmitter
Within the nasal cavity, odorant molecules interact with the cilia on odorant receptor cells. The binding of odorant molecules onto receptor proteins causes a net change in the membrane permeability of the receptor cells which then causes an action potential to be generated by the receptor cell. Unlike other senses, olfaction is not redirected by the Thalmus. It instead goes directly from the afferent receptor cells to the olfactory bulb. From the olfactory bulb, the action potential is sent directly to the cerebral cortex, specifically the limbic system (this is why there is a large emotional association with smell).
estrogen receptor, progesterone receptor, interleukin-2 receptor, and epidermal growth factor receptor.
This area is called the retina. It consists of different sets of receptor cells that are specialized in their function to aid in the perception of light and colour.
maybe nerve endings,skincells,or neurotransmitters
Direction associated with a particular retinal point. It is always perceived in the same direction if the light is received by the same retinal receptor. The capacity of a receptor to distinguish its excitation from that of its neighbours is referred to as local sign (or Lotze's local sign). This characteristic means that each retinal receptor has a unique oculocentric direction.Reference: Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann
a receptor
Yes they do if they want to go through the membrane except steroids they can go directly through
receptor