Final answer:
The four main types of tissue in the body are epithelial, connective, muscle, and nervous tissues, each having distinct roles such as protection, support, movement, and communication.
Step-by-step explanation:
The human body is composed of four main types of tissues, each with distinct functions. Epithelial tissue serves as a protective layer, covering the body and lining organs and cavities, controlling the movement of substances in and out. Connective tissue supports and protects the body's organs; it integrates different parts of the body and varies in density and function, from the hardness of bone to the fluidity of blood.
Muscle tissue is crucial for movement, including voluntary movements like walking as well as involuntary movements such as the beating of the heart. Lastly, nervous tissue is responsible for transmitting and processing information throughout the body, functioning as the communication network.