The organization of the human body

All living organisms are made of one or more cells

HOW SMALL ARE CELLS?

Organization levels in the alive organisms

Increase of the complexity

There are 4 primary tissue types in the human body: epithelial tissue, connective tissue, muscle tissue and nerve tissue. In this image you can see different connective tissues.

An organ is a structure that contains at least two different types of tissue functioning together for a common purpose.

Different types of epithelial tissues

Our body it is formed by cells of different types

The vegetables also are constituted by cells that form tissues

Henrietta Lacks, mujer aforamericana de 31 años y madre de 5 hijos, falleció el 4 de octubre de 1951, víctima de cáncer de cérvix de útero. Los doctores Grey, que la atendieron, extrajeron de su cuerpo células malignas que cultivaron en el laboratorio, consiguiendo así las primeras células capaces de sobrevivir sin el soporte vital del cuerpo. Cada 24 horas las células de Henrietta se duplicaban. Un año después de su fallecimiento, 20.000 tubos semanales de células Hela se enviaban a todo el mundo, unos seis billones de células.

Se calcula que actualmente la masa total de células HeLa cultivadas en laboratorios es superior al número total de células que había en el cuerpo de Henrietta.

The longest of cells are nerve cells, some are over a meter long in humans. The longest of nerve cells in any species are be found in the colossal squid, with some nerve cells estimated to be over 10 meters in length.

What is the longest cell?