Internal cells:
Internal cells are cells that are located inside an organism or tissue, surrounded by other cells and structures. They are not directly exposed to the external environment. Internal cells can perform various functions, such as metabolism, reproduction, and providing structural support. Examples of internal cells include those found in the liver, muscles, and internal organs.
External cells:
External cells are cells that are located on the outermost layer of an organism or tissue, directly facing the external environment. They are exposed to the external conditions and serve as a protective barrier. External cells can perform functions such as nutrient absorption, secretion, and sensory reception. Examples of external cells include skin cells, epithelial cells lining internal cavities, and hair cells.
The distinction between internal and external cells is crucial for understanding the organization and function of tissues and organisms. Internal cells are essential for maintaining the internal environment and carrying out various physiological processes, while external cells provide protection and interact with the external environment.
