organ and organ system

The tissues are organized to form organs to perform certain functions. All these organs constitute an organ system. This is very essential for an organism to function.
Cells form tissues form which in turn form organs; and form organ system.
This means that every organ is composed of many tissues.
For example, our heart consists of all the four types of tissues- epithelial, connective, muscular and neural.

Organ and organ system

In multicellular organisms, the fundamental tissues indicated above arrange to form organs, which then associate to form organ systems. Such organization is required for the millions of cells that make up an organism's activities to be more efficient and coordinated. One or more types of tissues make up each organ in our body. Our heart, for example, is made up of all four types of tissues: epithelial, connective, muscular, and neural. After some thorough examination, we also discover that the complexity of organs and organ systems follows a predictable pattern. The term for this discernible pattern is the evolutionary trend. The morphology and anatomy of three species at various evolutionary levels are reviewed below to demonstrate how they are organized and operate.The study of form or externally observable features is known as morphology. The term morphology only refers to this in the case of plants or microorganisms. This refers to the exterior appearance of organs or sections of the body in animals. The term anatomy is commonly used to describe the morphology of internal organs in animals. The earthworm, cockroach, and frog, which represent invertebrates and vertebrates, will be studied for their morphology and anatomy.