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1 Respiratory system. 2 What are we going to learn ? Function of the respiratory system Main parts of the respiratory system Exchange of gases in the.

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Presentation on theme: "1 Respiratory system. 2 What are we going to learn ? Function of the respiratory system Main parts of the respiratory system Exchange of gases in the."— Presentation transcript:

1 1 Respiratory system

2 2 What are we going to learn ? Function of the respiratory system Main parts of the respiratory system Exchange of gases in the lungs

3 3 Function of the respiratory system Inhale air containing Oxygen Absorb Oxygen into the blood Remove Carbon dioxide from the blood and take it out of the body by exhaling Body cells Heart Respiratory system and circulatory system are closely related û Lungs

4 4 Main parts of the respiratory system Respiratory tract Function: Inhale air into the lungs Main parts Nostrils Pharynx Larynx Trachea Bronchi (left and right) Respiratory organs Function: Exchange of Oxygen and Carbon dioxide in the blood Main parts: Lungs Bronchioli Alveoli Nose Mouth Pharynx Larynx Trachea Bronchi Lung Heart Ribs Diaphragm Bronchioli Alveoli

5 5 Exchange of gases in the alveoli Small artery Small vein Branch of pulmonary artery Capillary Branch of pulmonary vein Air in the alveolus Network of capillaries Thin wall of the alvelolus Capillary Oxygen-rich blood to the lungs Red blood cells Oxygen in the air is absorbed in the blood stream of the capillaries Simultaneously carbon dioxide in the blood stream is drawn into the alveolus by diffusion Bronchiolus Alveoli

6 6 The process of breathing Inhalation Diaphragm expands and comes down The volume of chest cavity increases Air pressure in the lungs reduces and external air gets into the respiratory tract Exhalation Inhalation Ribs Lungs Diaphragm Exhalation Diaphragm contracts and takes a convex shape The volume of chest cavity reduces Air pressure in the lungs increases and air is pushed out

7 7 Video

8 8 The End


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