The Respiratory System
Watch Brainpop: Respiratory System & Asthma Lungs • Lungs help the body breathe. • The upper part of the chest is almost filled with lungs. • Lungs can hold about as much air as a basketball!
Lungs Working With the Heart • Lungs trade air with blood. The heart pumps used blood to the lungs. The lungs take the carbon dioxide and other things that the body cannot use out of the blood. • The lungs add oxygen to the blood. • After the trading is done, the blood goes back to the heart to be pumped to the body to deliver oxygen to the Watch Brainpop: cells. Respiratory System & Asthma
What makes up the respiratory system? 1. Lungs 4. Alveoli • you have two lungs. • Tiny air sacs at the tips of the • the lung on the left side of bronchial tubes your body is a bit smaller than • Lungs contain over 600 million the lung on the right. This alveoli extra space on the left leaves • Each alveoli is surrounded by room for your heart. capillaries • Your lungs are protected by 5. Diaphragm your rib cage • Beneath the lungs is the 2. Trachea diaphragm, a dome-shaped • windpipe muscle that works with your 3. Bronchi / Bronchial tubes lungs to allow you to inhale • The windpipe breaks off into (breathe in) and exhale two tubes called bronchi. The (breathe out) air. bronchi branch off like a tree into bronchial tubes
Draw bronchi and label this diagram, using your “slide guide” to help you! trachea alveoli bronchioles diaphragm
How do Alveoli work? ? When you breath in your lungs expand take in oxygen. This oxygen goes straight to your alveoli. The capillary that surrounds the alveoli picks up that oxygen and drops of CO 2 to be exhaled. Draw this picture on the back of your paper
How does the Diaphragm work? ? When your diaphragm pulls down, it not only leaves more space for the lungs to expand but also lowers the internal air pressure. Outside, where the air pressure is greater, you suck in air in an inhale. The air then expands your lungs like a pair of balloons. When your diaphragm relaxes, the cavity inside your body gets smaller again. Your muscles squeeze your rib cage and your lungs begin to collapse as the air is pushed up and out your body in an exhale.
True or False? We inhale because the air pressure inside the chest cavity is less than outside the body. T The lungs are composed of hundreds of tiny air sacs called alveoli. T Oxygen is absorbed into the bloodstream in the trachea. F The bronchial tubes branch off from the trachea into an upside down Y. T
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