RESPIRATORY SYSTEM Human physiology

 Your cells need food (digestive system) and oxygen  Respiration is the process that gets oxygen to the cells and removes waste gases. BREATHING FOR LIFE

THE RESPIRATORY SYSTEM  1 st step: breathing air into your mouth and/or nose Nasal - nose cavity Oral – mouth cavity Diaphragm – sheet of muscle under lungs  2 nd step: air passes structure called larynx Larynx – voice box contains vocal cords Vocal cords vibrate to produce sounds for speech

THE RESPIRATORY SYSTEM  3 rd step: trachea Trachea a long tube leading to your lungs Trachea is also called your windpipe Epiglottis – flap of skin that closes over trachea when you swallow (so food doesn’t get into lungs!  4 th step: bronchi &bronchioles Bronchi are 2 small tubes which enter the lungs Become smaller tubes within the lungs called bronchioles  5 th step: lungs Your lungs are like sponges Many small air sacs that fill up when you breath in Oxygen passes from air sacs into your blood

THE RESPIRATORY SYSTEM  Your blood carries the oxygen to all of your cells  Oxygen combines with food to make energy that you need  Waste products (carbon dioxide and water vapor) are produced  Waste products are carried back to you lungs and you breath them out!

mouth Bronchioles Air sacs

EXIT SLIP 1.What path does air take after entering the body? 2. How does oxygen pass from your lungs into your blood? 3. What are the waste products that we breathe out? Through the walls of the air sacs Air goes down the throat to the larynx, trachea, bronchi and then lungs Carbon dioxide and water vapor