The Organization of the Human

Body

Presentation by

Liannette Bellido Cintrón

BIOLOGY AND GEOLOGY

3˚ ESO

I.E.S. FRANCISCO RODRÍGUEZ MARÍN

• All living things are made up of cells, the most basic and fundamental unit.

• Cells are capable, by themselves, of the three vital functions: nutrition, interaction and reproduction.

• The cells in a multicellular organism come together to form a superior structure that carries out these funtions.

• Characteristics of multicellular organisms:– All the cells in a multicellular

organisms cells come from the division of one initial cell, called the zygote or egg cell.

– Despite all our cells come from one inicial cell, multicellular organisms are made up of different cells, specialized in different functions.

– As a consecuence of the especialization of these cells, the organism shares the work between different systems.

– All the cells of an organism co-ordinate their activities to allow a total activity of the organism.

True or False?

Human beings are multicellular organisms.

TRUE!

• Cells that have similar form and characteristics, form tissues that are specialized in carrying out certain functions.– E.g Covering tissues, supporting tissues,

storing tissues, muscle tissue etc.

• Tissues join to form organs. Each organ carries out a specific function in the organism. For example, the heart pumps blood.

Can you name other organs?

• A collection of organs that carry out related functions make up a system.– e.g Digestive system:

•

Can you name other systems?

• The collection of all organs and systems make up a multicellular organism.

• The human being, like any living thing, carries out the 3 vital functions: Nutrition, interaction and reproduction. The body parts implicated in these functions are:– Nutrition

– Interaction

– Reproduction

Digestive system

Circulatory system

Excretory system

Respiratory system

Nervous system

Musculoskeletal system

Endocrine system

Sensory organs

Male reproductive system

Female reproductive system