respiratory system what is the main role of the respiratory system? the respiratory system brings...
TRANSCRIPT
Respiratory System• What is the main
role of the respiratory system?
• The respiratory system brings oxygen from the air into the body.
• It also removes the carbon dioxide (cellular waste) from inside the body.
Respiration• Breathing refers to
the process of inhaling and exhaling air from our lungs.
• Respiration is the process of chemical reactions that occur inside cells in the body.
• Respiration allows cells to release energy.
Body System Teamwork• The respiratory
system works in cooperation with the digestive and circulatory systems.
• The digestive system brings nutrients into the body.
• The respiratory system brings oxygen into your body.
• The circulatory system then takes the nutrients and the oxygen to your cells.
How Does Air Get To The Lungs?
• Air first travels into the body through the nose (or mouth).
• The nasal cavity contains mucus, which warms, moistens, and cleans the air we breathe.
• Inside of the nose are cilia, which are hair-like. They push the mucus back to the esophagus.
How Does Air Get To The Lungs?
• From the nasal cavity, air flows back through the pharynx (throat) and trachea (windpipe).
• The epiglottis is a small flap of tissue that closes when you swallow, sending food into the esophagus and not into the trachea.
How Does Air Get To The Lungs?
• After the trachea, the air moves into the left and right bronchi, within the lungs.
• The bronchi get smaller and smaller within the lungs until they reach tiny sacs at the very end.
• These structures are called alveoli.
Alveoli• Alveoli are tiny sacs
at the ends of the bronchi.
• There are over 300 million alveoli in the lungs.
• The alveoli are covered with capillaries.
• It is in the alveoli that the gas exchange takes place.
Alveoli & Gas Exchange
• Blood that is low in oxygen and full of carbon dioxide arrives at the alveoli.
• The carbon dioxide is then released from the blood into the alveoli, and exhaled from your body.
Alveoli & Gas Exchange
• At this same time, oxygen that is in the alveoli enters the bloodstream through the capillaries, to be taken back to the heart, then to the rest of the body.
• This is known as gas exchange.
Breathing• Our breathing is
controlled by a muscle called the diaphragm.
• When we inhale, the diaphragm contracts and flattens, allowing us to fill our lungs.
• When we exhale, our diaphragm relaxes, moving upward, causing the air to be pushed out of our lungs.
Smoking• No matter what anybody
tells you……. SMOKING KILLS YOU!
• Tobacco smoke contains tar, carbon monoxide, and nicotine.
• Each of these substances destroys your respiratory system!
Smoking• This is a picture of
two lungs.• The photo on the left
is that of a healthy lung.
• The photo on the right is the lung from a smoker.
• Imagine trying to get oxygen through there??