The type of cellular receptor shown in the image is more likely extracellular. From the word extracellular, it refers to the outside of the cell. And it shows in the picture that the receptors come from the outside of the cell and enter the cell through the help of cell membrane that helps the outside and inside of the cell to communicate.
It is stated in the Unified Cell Theory by a Botanist named Schleiden and a Zoologist named Schwann that all Living Things (organisms) are composed of 1 or more cells. The cell is the basic unit of life.
