1. Human Organ Systems The Respiratory System The Respiratory System

2. Function The respiratory systems main job is gas exchange. The respiratory systems main job is gas exchange. The respiratory system supplies your body with oxygen needed for respiration. The respiratory system supplies your body with oxygen needed for respiration. The respiratory system also works to remove CO2 gas. The respiratory system also works to remove CO2 gas.

3. Function cont. Your respiratory works with other organ systems to help you maintain homeostasis. Your respiratory works with other organ systems to help you maintain homeostasis. Digestive and Circulatory: Respiratory system works with these two systems to provide the raw materials for cellular respiration. Digestive and Circulatory: Respiratory system works with these two systems to provide the raw materials for cellular respiration. Excretory system: The respiratory system aids in the removal of metabolic wastes: CO 2 and H 2 O Excretory system: The respiratory system aids in the removal of metabolic wastes: CO 2 and H 2 O

4. Components Nose: Nose is the primary entry and exit site of gases in the body. Mucous and Cilia (fine hairs) help to moisten and filter the air you breath. Nose: Nose is the primary entry and exit site of gases in the body. Mucous and Cilia (fine hairs) help to moisten and filter the air you breath. The air is also warmed as it passes through your nasal passageways. The air is also warmed as it passes through your nasal passageways. Mouth: Secondary entry and exit site for gases. Important especially during physical exertion when the body needs more O 2 and is producing more CO 2. Mouth: Secondary entry and exit site for gases. Important especially during physical exertion when the body needs more O 2 and is producing more CO 2.

5. Pharynx, Larynx and Trachea Once the air leaves your nose or mouth, it next travels into your Pharynx (Throat). Once the air leaves your nose or mouth, it next travels into your Pharynx (Throat). Next the air passes through your larynx (Voicebox) Next the air passes through your larynx (Voicebox) The air then travels past a protective flap on tissue called the epiglottis, and into your trachea (Windpipe). The air then travels past a protective flap on tissue called the epiglottis, and into your trachea (Windpipe). The trachea carries the air into your lungs. The trachea carries the air into your lungs.

6. Lungs Another important component of the respiratory system are the lungs. Another important component of the respiratory system are the lungs. The lungs are lobed air sacs that are found in the thoracic cavity. The lungs are lobed air sacs that are found in the thoracic cavity. The right lung has 3 lobes, the left lung has 2. The right lung has 3 lobes, the left lung has 2. They are surround by a thin membrane called the Pleura. They are surround by a thin membrane called the Pleura.

7. Air vessels You trachea splits off into two large air tubes called the left and right Bronchi. You trachea splits off into two large air tubes called the left and right Bronchi. The bronchi branch off to form smaller tubules called bronchioles The bronchi branch off to form smaller tubules called bronchioles The bronchioles get even smaller and end up in small grapelike bundles called alveoli. The bronchioles get even smaller and end up in small grapelike bundles called alveoli. It is at the alveoli that gas exchange occurs. It is at the alveoli that gas exchange occurs.

8. A two-way street Unlike your digestive system, your respiratory system only one point of entry and exit. Unlike your digestive system, your respiratory system only one point of entry and exit. Air flows into your body is this order. Air flows into your body is this order. Nose or mouth  Pharynx  Larynx  Trachea  left or right bronchi  bronchioles  Alevoli. o It leaves your body through the same structures just in reverse order.

9. Air pressure The air flows into and out of your lungs due to differences in air pressure inside and outside your lungs. The air flows into and out of your lungs due to differences in air pressure inside and outside your lungs. Every breath you take has two components, an inhalation, and an exhalation. Every breath you take has two components, an inhalation, and an exhalation. Inhalation requires energy while exhalation does not. Inhalation requires energy while exhalation does not.

10. “I never inhaled” –B. Clinton When you inhale, a large muscle located at the bottom of your lungs called the diaphragm contracts. When you inhale, a large muscle located at the bottom of your lungs called the diaphragm contracts. When the diaphragm contracts, it pulls downward on your lungs, causing them to increase in volume. When the diaphragm contracts, it pulls downward on your lungs, causing them to increase in volume. As volume is increased, the air pressure inside you lungs decreases. As volume is increased, the air pressure inside you lungs decreases. The air moves from high pressure (outside) to low pressure (inside) The air moves from high pressure (outside) to low pressure (inside)

11. Waiting to exhale When you relax your diaphragm it allows the lungs to go back to their relaxed state. When you relax your diaphragm it allows the lungs to go back to their relaxed state. The lungs lose volume which causes the air pressure to increase. The lungs lose volume which causes the air pressure to increase. This increase in air pressure causes the air in your lungs to be forced out of your body. This increase in air pressure causes the air in your lungs to be forced out of your body.

12. Breathing summary Inhalation: Volume of lungs increases, air pressure decreases, air flows in. Inhalation: Volume of lungs increases, air pressure decreases, air flows in. Exhalation: Volume of lungs decreases, air pressure increases, air flows out. Exhalation: Volume of lungs decreases, air pressure increases, air flows out. Also aiding in this process are muscles between your ribs called intercoastals. Also aiding in this process are muscles between your ribs called intercoastals. The intercoastals help increase the volume of your lungs by expanding the rib cage during inhalation. The intercoastals help increase the volume of your lungs by expanding the rib cage during inhalation.

13. Video Lets watch a short video that will give us a good look at what happens everytime we breathe in, and breathe out. Lets watch a short video that will give us a good look at what happens everytime we breathe in, and breathe out. Respiratory system video Respiratory system video Respiratory system video Respiratory system video