There are many phrases that express this idea. See the link.
"Receptor sites are like baseball mits waiting to catch a baseball - in this case oestrogen. The action of genistein is to 'fool' the receptor sites, making them ..."
"Receptor sites are like little antennae on the cell that receive specific cytokines like a lock fits into a key"
There are different types of parking spaces: regular, handicapped, motorcycles and maybe large ones for trucks and RVs. Receptor sites come in many different flavors that are specific for their particular ligand.
"thermoreceptors are like sensors, and when it is too cold or too warm they send signals to the hypothalamus. The Hypothalamus is in the middle of the brain and regulates body temperature. The thermoreceptors in the hypothalamus help regulate the temperature of blood in the brain."
"A receptor protein is like a key lock, very specific and only the right key can use it "
" A receptor protein is like the "eyes and ears" of a cell. When certain hormones interact with the receptor or bind to it, the receptor tells the cells what to do."
"The dopamine receptor, located on the cell surface, is like a fishing pole that catches dopamine. Methylation supports receptor activity by keeping the phospholipids in the cell membrane fluid. Membrane fluidity also aids proper signaling of the immune system and protects nerves from damage. The symptoms of diseases such as ALS and Alzheimer's disease result from nerve damage."
"The dopamine receptor, located on the cell surface, is like a fishing pole that catches dopamine."
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