The human being
1. The human being
It is defined as a rational living being. When we speak about the human being, we refer to men and women.
In the human body, we can distinguish: cells, tissues, organs, systems and functions.
The human body is composed of cells, which are very small elements and make the functions of the living being: to be born, to grow, to reproduce and to die.
The main parts of the cell are: the membrane, the nucleus and cytoplasm.
Cells form tissues.
In the picture, we can see a cell.
Cells join to create tissues in order to make certain functions.
We distinguish four kinds of tissues:
- Epithelial tissue, which forms the skin. It covers and protects the body.
- Osseous tissue that forms bones. They constitute the skeleton.
- Muscle tissue that forms the muscles. With the skeleton, they form the musculoskeletal system.
- Nervous tissue is composed of nerve cells that form the encephalon, the spinal cord and the nerves of the body.
4. Indicate the type of tissue: epithelial, osseous, muscle or nervous