Your SlideShare is downloading. ×
Respiratory system
Respiratory system
Respiratory system
Respiratory system
Respiratory system
Respiratory system
Respiratory system
Respiratory system
Respiratory system
Upcoming SlideShare
Loading in...5

Thanks for flagging this SlideShare!

Oops! An error has occurred.

Saving this for later? Get the SlideShare app to save on your phone or tablet. Read anywhere, anytime – even offline.
Text the download link to your phone
Standard text messaging rates apply

Respiratory system


Published on

Published in: Business, Technology
  • Be the first to comment

No Downloads
Total Views
On Slideshare
From Embeds
Number of Embeds
Embeds 0
No embeds

Report content
Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

No notes for slide


  • 1. The Respiratory System: the exchange of gases
    • Section Objectives:
    • Identify the structures involved in external respiration.
    • Contrast external and cellular respiration
    • Explain the mechanics of breathing.
  • 2. Passageways and Lungs
    • respiratory system consists of a pair of lungs & a system of tubes that carry air to them
    • Breathing is just one of the functions that the respiratory system carries out.
  • 3. The path air takes
    • air enters through the nasal cavity
      • It passes through the pharynx and larynx into the trachea
      • The trachea forks to form two bronchi
      • Each bronchus branches into numerous bronchioles
    • The bronchioles end in clusters of tiny sacs called alveoli
  • 4.  
  • 5. Alveoli: The place of gas exchange
    • Alveoli : the sacs of the lungs where oxygen and carbon dioxide are exchanged by diffusion between the air and blood.
    • surrounded by networks of tiny blood vessels, or capillaries.
    • External respiration: exchange of gases between alveoli and blood
    • Cellular respiration: use of O 2 to create ATP in mitochondria
  • 6. Blood transport of gases
    • oxygen diffuses into the blood vessels surrounding the alveoli, it is pumped by the heart to the body cells, where it is used for cellular respiration
    • carbon dioxide ( a waste product ) diffuses into the blood, which carries it back to the lungs
    • During exhalation, this carbon dioxide is removed from your body.
  • 7. The Mechanics of Breathing
    • Breathing ventilates the lungs
    • The action of your diaphragm and the muscles between your ribs enable you to breathe in and breathe out.
    • Breathing is the alternation of inhalation (active) and exhalation ( passive)
  • 8. Control of Respiration
    • Breathing is usually an involuntary process.
    • partially controlled by an internal feedback mechanism that involves signals being sent to the medulla oblongata about the chemistry of your blood.
    • medulla oblongata responds to higher levels of carbon dioxide in your body by sending nerve signals to the rib muscles and diaphragm.
    • nerve signals cause these muscles to contract, and you inhale.
  • 9. Cleaning dirty air
    • To prevent foreign material from reaching the respiratory system is lined with ciliated cells that secrete mucus.
    • The cilia constantly beat upward in the direction of your throat, where foreign material can be swallowed or expelled by coughing or sneezing