What is a membrane in biological terms?

In biological terms, a membrane refers to a thin layer of tissue that forms a barrier or boundary within the body. This layer can be composed of different types of cells and serves various functions, such as separating different bodily compartments, facilitating the exchange of materials, and protecting underlying structures. For instance, cell membranes encase individual cells, while membranes lining organs can help maintain homeostasis and support physiological functions.

Membranes play critical roles in many biological processes, including communication between cells, transport of molecules, and contributing to the structural integrity of tissues. Their semi-permeable nature allows them to regulate the passage of substances, making them essential to cellular function and overall body physiology.