Plasma membrane and cytoplasm

Plasma membrane and cytoplasm

Introduction

All cells are surrounded by a thin membrane composed primarily of phospholipids and proteins to the plasma membrane. In order to leave or enter the cell, all substances must pass through the plasma membrane (Hunter and Borg, 2003). This transition can occur in two ways: either the substance passes through the membrane or subsumed by it. In the first case the transition can happen without expenditure of energy (passive transport) or energetic (active transport). The process of aggregation of substances through the plasma membrane is called endocytosis, where the substance enters the cell, ...