What does the term "intercellular" refer to?

The term "intercellular" specifically refers to the space or area that exists between cells. This concept is significant in various biological and medical contexts, particularly when discussing how cells interact with one another, communicate, or exchange substances. Intercellular spaces can be filled with interstitial fluid and can facilitate processes like nutrient exchange or immune responses.

In contrast, the other options describe different relationships: "between tissues" refers to the relationship between distinct tissue types rather than individual cells. "Within cells" pertains to processes and structures that occur inside a single cell, which is distinct from intercellular contexts. "Through membranes" suggests the movement of substances across cell membranes, but again does not address the space specifically between two or more cells. This understanding of "intercellular" is essential for grasping topics related to cell biology and tissue dynamics in cosmetology and aesthetics.