Cell membranes are selectively permeable barriers that surround cells, maintaining homeostasis by regulating the movement of substances in and out of the cell. They are composed of a phospholipid bilayer with embedded proteins that facilitate communication and transport across the membrane.

Cell Membranes

Cell membranes

selectively permeable barriers

Homeostasis is the physiological process by which biological systems maintain stability and equilibrium in response to changing external conditions. It is essential for the survival of organisms, enabling them to regulate internal environments such as temperature, pH, and ion concentrations to ensure optimal functioning.

homeostasis

regulating the movement of substances

The phospholipid bilayer is a fundamental component of cell membranes, consisting of two layers of phospholipids with hydrophilic heads facing outward and hydrophobic tails facing inward, creating a semi-permeable barrier. This structure is crucial for maintaining cell integrity and facilitating the selective transport of substances in and out of cells.

phospholipid bilayer

embedded proteins

Communication across the membrane

transport across the membrane

The Structure and Function of Cell Membranes

Understanding Double Membranes in Chloroplasts and Mitochondria

Fundamentals of Biochemistry: Structure and Function of Biomolecules

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