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A breath of life The Respiratory System Prof. Luigi García Saavedra.

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Presentation on theme: "A breath of life The Respiratory System Prof. Luigi García Saavedra."— Presentation transcript:

1 A breath of life The Respiratory System Prof. Luigi García Saavedra

2 The human respiratory system picks up oxygen from the air we inhale and releases carbon dioxide into the air we exhale

3 Structures

4 Nose – Hair lining: filtering – Inner nasal cavity and Sinuses : warming, production of mucus

5 Pharynx (throat) – Pasageway for air and food Larynx – Between pharynx and trachea – Vocal cords Trachea (windpipe) – Epiglotis closes when we swallow food or liquids

6 Bronchi – Bronchioles – Each bronchus leads to one lung – Bronchi divide into smaller passageways (bronchioles) – Surrounded by smooth muscle – They keep dividing until reaching tiny sacs called Alveoli – Place where the gas exchange takes place

7 Alveoli – Each one is surrounded by capillaries – Alveolar sac: group of alveoli – Alveolar sacs are group together in lobules of greater size each time – Lobules are grouped in segments and segments in lobes Lungs – Right lung: 3 lobes – Left lung: 2 lobes

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9 End of class 3

10 Gas Exchange and Transport

11 Oxygen and carbon dioxide are exchanged across the walls of alveoli and capillaries. Chemical properties of blood and red blood cells allow for efficient transport of gases througout the body.

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13 End of class 4

14 Breathing

15 Movements of the diaphragm and rib cage change air pressure in the chest cavity during inhalation and exhalation.

16 Diaphragm

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19 Smoking

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25 End of class 5


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