Now we have finally journeyed to the place where it all starts. The chlorphylls and other pigments that start the process are here, on the outer layer of the thylakoids. Photons from sunlight hit the pigments, electrons are "knocked" loose, and off they go to energize the complicated process of photosynthesis.
Sometimes the thylakoid is also called the photosynthetic membrane. That is easier for some of us to remember. The membrane and the space inside it (shown in yellow), is where the light or light-dependent reaction takes place. The so-called dark, or light independent reactions, take place in the stroma (shown in gray here).
Endocytosis is the reverse of exocytosis and can occur in a variety of forms. Phagocytosis ("cell eating") is the process by which bacteria, dead tissue, or other bits of material visible under the microscope are engulfed by cells. The material makes contact with the cell membrane, which then invaginates. The invagination is pinched off, leaving the engulfed material in the membrane-enclosed vacuole and the cell membrane intact. Pinocytosis ("cell drinking") is essentially the same process, the difference being that the substances ingested are in solution and not visible under the microscope.  Phagocytosis and pinocytosis are both undertaken in association with lysosomes which complete the breakdown of the material which has been engulfed.