GENERAL HISTOLOGY

Detailed explanation-1: -The internal membrane system of a cell is known as the endoplasmic reticulum. This system of membranes is so extensive throughout the cell that it accounts for more than half the total membrane in a cell.

Detailed explanation-2: -The endoplasmic reticulum, or ER, is an extensive system of internal membranes that moves proteins and other substances through the cell.

Detailed explanation-3: -All eucaryotic cells have an endoplasmic reticulum (ER). Its membrane typically constitutes more than half of the total membrane of an average animal cell (see Table 12-2). The ER is organized into a netlike labyrinth of branching tubules and flattened sacs extending throughout the cytosol (Figure 12-35).

Detailed explanation-4: -Endoplasmic reticulum is a network of membranes inside a cell through which proteins and other molecules move. Proteins are assembled at organelles called ribosomes.