The Mackay SchoolFifth Grade 2014

THE ORGANIZATION OF CELLS IN MULTICELLULAR LIFE FORMS

Cells in multicellular life forms are organized and coordinated. Thus, a life is able to perform all of its functions. Cells interact with each other, but they are not all the same.

Tissues are made of a group of cells working together. They develop the same function. Muscle tissue makes you able to move. Nerve tissue forms the nerves and the nerves transmit impulses to every part of your body. Epithelial tissue, like the skin, covers and protects the body.

Organs are formed by different types of tissues.

Systems are groups of organs working together. It is the most complex organization within our bodies. Systems work on different functions. These are three of them:

a. The nutrition function, which is carried out by the respiratory system, the circulatory system and the excretory system. It is a group of processes in charge of exchanging matter and energy.

b. The Interaction function, which begins with the sense organs gathering information from the environment, this information is received by the nervous system. The nervous system processes the information and sends it to the locomotor and other systems, and these systems react to the signal.

c. The reproduction function, when special cells join together and forma new life form. This new life form ensures the numbers and characteristics of the species.

The Mackay SchoolFifth Grade 2014

AnalyzeComplete the chart using a ✔where it corresponds.

Life form Number of cells Organization of cells

Unicellular Multicellular

Tissues Organs Systems

Elephant

Human

Tiger

Dog

Paramecium

Yeast

Bacterium

What type of cell is represented in the picture? Research and label it.

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