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Respiratory System Notes Notebook page 1. Respiration • Moves oxygen (O2 )from the outside environment into the body • Removes carbon dioxide (CO2 ) and water (H2O ) from the body. • Respiration- the process in which oxygen and glucose undergo a complex series of chemical reactions inside cells. Fueling your Cells 2. Path of Air: As air travels from the outside environment to the lungs, it passes through the following • Nose- inhales air • Pharynx- throat • Larynx- voice box, contains vocal cords • Trachea- windpipe • Bronchi- trachea splits into 2 tubes • Lungs- contains alveoli (air sacs) • Alveoli- place where CO2 is exchanged for O2. 3. Gas Exchange • After air enters an alveolus, oxygen passes through the wall of the alveolus • Then through the capillary wall into the blood. • Carbon dioxide and water then pass from the blood into the alveoli. 4. How you Breathe • When you breathe, the actions of your rib muscles and diaphragm expand or contract your chest. As a result, air flows in or out. • Diaphragm- a large dome-shaped muscle located at the bottom of the rib cage • Works with the rib muscles to suck in air. The Breathing Process 5. Breathing and Speaking • Two vocal cords, folds of connective tissue that produce your voice, stretch across the opening of the larynx. • Air moving over the vocal cords causes them to vibrate and produce sound. Complete on page 204 • Create a flow chart showing how we breathe. • Use your notes or book page 573 to help you. • Use color!