LESSON 1 THE RESPIRATORY SYSTEM

RESPIRATION

• Your body needs oxygen for cellular respiration.
• Cellular respiration is the sequence where your body
• breaks down glucose/sugar by using oxygen and then
• releases the chemical energy in the glucose to power cells.
• When your breath out, you release carbon dioxide and oxygen.

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• In order for this process to work, the body must work Together.
• Blood, which is part of the circulator system carries the oxygen from
• the respiratory system and glucose from the digestive system to
• body cells to complete the process of resperation.

PARTICALS IN YOUR LUNGS

• When you breathe, particals such as pollen and dust
• may travel with air into your nose. Nose hairs help
• stop these particals but only large ones are stopped.
• Pass the nose hairs are a special wall of cells thatrr
• poeuce mucus to stop even more particals.

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• Past the nose starts the throat or pharynx.
• When you swallow a flap in your throat stops food from
• entering your lungs. This flap is called epiglottis
• In your throat there is also thosanda of little hairs that sweep
• mucus around your throat, and particals that irritate this

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• will make you cough thus spitting them out.

HOW DO YOU BREATHE

• Like other body movements breathing is controlled
• by muscles. The lungs are surrounded by ribs which also has muscle
• attached to them. At the base of the lungs is a muscle called the diaphragm.
• A diaphragm is a large dome shapes muscle. You use it to breathe.
• The diaphragm and ribs contract as you breathe allowing more

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• air to enter.

GAS EXCHANGE

• Blood travels through the body and drops off
• carbon dioxide in the alveolus.
• The blood gets rich in okygen upon entering the capillary.
• The blood then travels up the branch of bronchus and
• then goes to the rest of the body.

END OF LESSON 1 CHAPTER 5 NOTES