Let’s find out how the body takes in oxygen and keeps us alive! Respiratory System Let’s find out how the body takes in oxygen and keeps us alive!

Respiration is Breathing We can only go for a few minutes without breathing. Muscles around our lungs help us breathe because lungs are NOT muscles. When we breath in we “inhale” When we breath out we “exhale”

Breathing through your nose is better than your mouth When we breathe through our nose three good things happen to the air we take in: 1. The air is moistened from the mucus in our nose 2. The air is warmed from the mucus in our nose 3. The air is cleaned from the small hairs called cilia in our nose Our lungs like moist, warm, clean air!!

Gases we breathe in and out We inhale the oxygen our bodies need from the air. We exhale the carbon dioxide waste our bodies do not need into the air. This process is called RESPIRATION!! The two main organs, the lungs, take in the oxygenated air. The diaphragm, a muscle under the lungs, help this process.

The parts of the Respiratory System Nasal Cavity Nose Throat (pharynx) Mouth Wind Pipe (Trachea) Which is better to breathe through? The nose or the mouth?

More parts of the Respiratory System Throat (pharynx) Voice box (larynx) Windpipe (trachea) Bronchi Left Lung Right Lung Diaphragm

Inside the Lungs Right Lung Left Lung MAGNIFIEDDIAGRAM: Bronchial Tube Bronchial Tubes Air sac (Alveoli)

Respiratory System – Each part has a job! Nasal Cavity Produces mucus Nose Cleans, moistens and warms the air we breathe. Throat (pharynx) Nasal cavity and mouth meet here Wind Pipe (Trachea) Mouth Can take in air and helps do so when we breathe heavy Takes air into lungs, while helping to clean the air as it goes down

More parts of the Respiratory System & their jobs Throat (pharynx) Nasal cavity and mouth meet here Voice box (larynx) Windpipe (trachea) Allows sound to be created when air passes over vocal cords within our voice box Takes air into lungs, while helping to clean the air as it goes down Lungs Lightweight organs that take in oxygen Diaphragm Bronchi Muscle under lungs that allow us to inhale and exhale Two branches off the trachea and leading into the lungs

Inside the Lungs Right Lung Left Lung Bronchial Tube MAGNIFIEDDIAGRAM: Lightweight, main organ of the system Lightweight, main organ of the system. Do you notice what side it appears to be on in the diagram? Remember that a diagram is a mirror image of your actual body  Bronchial Tube The tubes inside the lungs leading to the air sacs (alveoli) MAGNIFIEDDIAGRAM: Air sac (Alveoli) The sacs where all air ends up. Capillaries surround all alveoli. Alveoli have very thin walls so the oxygen can pass through & get into our red blood cells & CO2 can pass out to be exhaled. We have millions of alveoli and they are very small! Bronchi Two branches off the trachea and leading into the lungs Bronchial Tubes The tubes inside the lungs leading to the air sacs (alveoli)

Capillaries surround every Alveoli

The Diaphragm is an important muscle The Diaphragm is what allows our lungs to take in Oxygen and release Carbon Dioxide. Our lungs could not do this on their own since they are not muscles!

The Diaphragm helps us breathe! When we breathe out, the diaphragm moves upward, forcing the chest cavity to get smaller and pushing the gases in the lungs up and out of the nose and mouth. When we breathe in, the diaphragm moves downward toward the abdomen, enlarging the chest cavity and pulling air in through the nose or mouth.

Imagine your Diaphragm like a smile  or a frown  When you are breathing in oxygen your diaphragm is smiling and bends downward to draw air into the lungs.

Imagine your Diaphragm like a smile  or a frown  When you are breathing out carbon dioxide your diaphragm is frowning and bends upward to push against the lungs and squeeze out the air.

Let’s watch this in action!! http://www.lungusa.org/site/pp.asp?c=dvLUK9O0E&b=40743

PATH OF AIR THROUGH THE RESPIRATORY SYSTEM Let’s write it out! Nose or Mouth Past the Pharynx Past the Larynx Down the Trachea Into the Bronchi which take air into the LUNGS Into the Bronchial Tubes Into the Alveoli Into our Red Blood Cells

What are some things that can damage our Respiratory System? Can you think of any? Smoking- damages your lungs and alveoli. It can lead to several harmful diseases: Cancer: Lung, Liver, Mouth, & on & on Emphysema Bronchitis Pollution- makes the air we breathe less clean and can cause allergies and worsen asthma if you have it.

Would you like to see a healthy lung and a smoker’s lung?!? Can you tell who was the smoker?

THE END! Tell your neighbor 3 things you learned about the Respiratory System. What are some affects on your respiratory system caused by smoking?