Page 62 - Science Class 07

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Respiration in Living Organisms

• Breathing • Respira on • Types of Respira on
• Fermenta on • Respira on in Human Beings • Process of Respira on
• Internal Respira on • Breathing in Other Animals • Respira on in Plants

Taking air inside the body and again giving out BREATHING
of the body is an important characters c of all Breathing is something that we all do without
living beings. Animals take in oxygen from the usually realizing it. We breathe in and out
atmospheric air which breaks down the food about 22,000 mes a day.
into simpler substances or nutrients. In this
We are powered by breathing. Our lungs fuel us
process, energy is released which our body
with oxygen, our body’s life-sustaining gas. Our
uses to carry out different life processes and
lungs breathe in air, then remove the oxygen
other ac vi es. This process goes on without
and pass it through our bloodstream, where it’s
any stop. Plants take in carbon dioxide to carry
carried off to the ssues and organs that allow
out the process of photosynthesis. In this
us to walk, talk and move.
process, plants synthesise carbon dioxide,
water and other minerals in the presence of Our lungs also take carbon dioxide from our
sunlight. The food produced by them is stored blood and release it into the air when we
in the different parts, in the form of chemical breathe out.

energy. A small amount of food or energy is Our brain controls how fast our lungs draw in
also consumed by the plants. Taking air inside air. When we exercise or play, our brain tells
the body and giving it out and breaking down our lungs to work faster.
of food are the two processes involved in the When we are sleeping or
comple on of these processes. resting, our lungs slow

We can group these two processes in: down.
v Breathing (external respira on) Our breathing and our
lungs are precious. We
v Respira on (internal respira on)
need to protect them.

62 Science-7