Respiratory System Notes Notebook page

1. Respiration Moves oxygen (O 2 )from the outside environment into the body Removes carbon dioxide (CO 2 ) and water (H 2 O ) 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 CO 2 is exchanged for O 2.

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!