Unit 2: Cells and Systems Topic 3: The Respiratory System

Respiratory System The respiratory system is responsible for Breathing. It supplies oxygen to your blood through Inhalation It removes Carbon Dioxide from your blood through Exhaling

How Does Breathing Work? Two major muscles: Diaphragm and Rib Muscles Inhale Ribs up Diaphragm down Creates a larger space Less concentration of air inside your body than outside therefore Diffusion causes air to flow into your lungs!

How Does Breathing Work? Two major muscles: Diaphragm and Rib Muscles Exhale Diagram goes up Ribs go down Decreases the size of chest cavity Therefore air is forced out of the lungs How can we prove we breathe out CO2?

Raceway through the Respiratory System 1) Nose and Mouth

Raceway through the Respiratory System 1) Nose and Mouth 2) Trachea Tube where air flows into and out of the lungs

Raceway through the Respiratory System 1) Nose and Mouth 2) Trachea Tube where air flows into and out of the lungs

Raceway through the Respiratory System 1) Nose and Mouth 2) Trachea Tube where air flows into and out of the lungs 3) The Bronchi Tube-like passageways leading off the Trachea and into the lungs

Raceway through the Respiratory System 1) Nose and Mouth 2) Trachea Tube where air flows into and out of the lungs 3) The Bronchi Tube-like passageways leading off the Trachea and into the lungs 4) The Bronchioles A more narrow version of Bronchi

Raceway through the Respiratory System 1) Nose and Mouth 2) Trachea Tube where air flows into and out of the lungs 3) The Bronchi Tube-like passageways leading off the Trachea and into the lungs 4) The Bronchioles A more narrow version of Bronchi 5) The Alveoli Tiny air sacks. One cell thick! Over 600 million in your body! This is where air flows into and out of your blood!

Raceway through the Respiratory System

A Little More Detail Alveoli are surrounded by capillaries (tiny blood vessels) Once Cell thick This allows for easy diffusion of oxygen and carbon dioxide! Alveoli Sac Blood inside Capillary receiving oxygen

A Little More Detail Alveoli are surrounded by capillaries (tiny blood vessels) Once Cell thick This allows for easy diffusion of oxygen and carbon dioxide! Looks pretty neat hey? Diffusion Air inside the alveoli has High Oxygen (O2) concentration and low carbon dioxide (CO2 ) concentration Capillaries in the blood have Low Oxygen (O2) concentration and High carbon dioxide (CO2 ) concentration

Discussion Time Why is breathing more difficult at higher altitudes? Why do some runners train at higher altitudes? What is the function of alveoli? What would happen if the alveoli stopped working properly?