Cells are smallest living organisms in a living thing. When similar cells work together, they make up tissue. Organs are groups of tissue working together. Living creatures require cells, tissues, and organs working in sync to properly function.
In the human body, there are many types of cells. Each cell is specialized to perform a specific function. Even blood cells are considered to make up connective tissue.
Groups of cells that work together form tissue. The different types of tissue include connective, muscle, epithelial and nerve tissue.
Organs contain two or more tissues. The liver, heart, and skin are organs of different tissue. The skin for example, is made up of an epidermis layer and a dermis layer.
When multiple organs work together to support a body’s function, they make up a system. The skeleton system is made of bones, cartilage, tendons and ligaments. All work together to support the human body.
Plants also have cells, tissues, and organs. The three major tissue types are dermal, vascular, and ground, making up the basic organs of roots, stems and leaves.