Tuesday, May 19, 2015 Bell Ringer: We know that we cannot survive very long without air (oxygen). Why do you think that is the case? What does oxygen do for us?
The Respiratory System
The system of the body that deals with breathing The body takes in the oxygen that it needs and removes the carbon dioxide that it doesn’t
The Oxygen Delivery System Main function - to supply the blood with oxygen Does this through breathing
Breathing and Respiration are NOT the same thing!
Breathing Moving air in and out of the lungs
Respiration Chemical reaction that releases energy
Inhalation Breathing in Body gets oxygen from the air Rib muscles contract to pull ribs up and out Diaphragm muscle contracts to pull down the lungs Tissue expands to force (pull) in air.
Exhalation Breathing out Get rid of carbon dioxide Rib muscles relax Diaphragm muscle relaxes Tissue returns to resting position and forces (pushes) air out
Parts of the System Mouth Nose Trachea –splits into bronchi –bronchioles Lungs –Bronchioles –Alveoli Diaphragm
Lungs Bronchial tubes Many smaller tubes Alveoli (alveolus) – surrounded by capillaries Average adult's lungs contain about 600 million of these air-filled sacs
Pathway of Oxygen Body breathes in the air which is pulled through the nose or mouth and down through the trachea
Pathway of Oxygen The trachea is a pipe shaped by rings of cartilage. It divides into two tubes called bronchi. Bronchi carry air into each lung.
Pathway of Oxygen Inside the lung, the tubes divide into smaller and smaller tubes called bronchioles. At the end of each of these tubes are small air sacs called alveoli. Capillaries, which are small blood vessels with thin walls, are wrapped around these alveoli.
Pathway of Oxygen Capillary walls are so thin and close to each other that the air easily diffuses through.
Pathway of Oxygen Oxygen diffuses through the capillaries into the bloodstream. Carbon dioxide in the bloodstream, diffuses through into the alveoli, and is then removed from the body when we breathe out.
The Diaphragm The muscle that controls the breathing process.
The Diaphragm The diaphragm flattens to cause the chest to expand and air is pulled into the lungs.
The Diaphragm When the diaphragm relaxes, the chest collapses and the air in the lungs is forced out.
Clip from earlier days…..
What is Cellular Respiration? Once the energy that was in sunlight is changed into chemical energy by photosynthesis, an organism has to transform the chemical energy into a a form that can be used by the organism. photosynthesis This process is cellular respiration.
+ Energy
Respiration Chemical reaction that releases energy
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