Explain the need for nutrition by living organisms.

The first 200 words of this essay...

BIOLOGY ASSIGNMENT

1) EXPLAIN THE NEED FOR NUTRITION BY LIVING ORGANISMS.

Nutrition is the science of how our bodies obtain energy, build tissue, and control body functions using materials supplied in the food we eat. Nutrients are chemical substances needed by the body. The need for nutrition by living organisms is essential for survival in the sense that it provides energy and material for growth and repair and for the general function of the human system and its maintenance. Different foods we eat contain at least one of the seven major nutrients namely; carbohydrate, protein, fats, vitamins, minerals, roughages and water. There are two types of nutrition Heterotrops and Autotrops -

We are unable to make our own food from the sun as plants do. We get our food by eating plants or other animals.

Our bodies need food for a variety of reasons:

Growth: Food, especially proteins, makes new cells and tissues as we grow.

Energy: The body is like a working machine that needs energy to keep it going. During cellular respiration food is changed into energy for many activities e.g. the heart pumping blood around our bodies. Energy rich