VIEWS: 2 PAGES: 4 POSTED ON: 8/7/2012
Lungs and respiratory system 1. Worksheet questions (5-10min) What are lungs for? How much air is there in the lungs (remember the introductory class)? Basic parts of respiratory system: nose, mouth, trachea, lungs, bronchi, diaphragm 2, Lung dissection (25 min). Tutor dissects sheep lungs while kids can touch the lungs wrapped in cellophane. Be able to answer the following questions: o What does each part of the respiratory system do? o What makes air go into the lungs? (Intercostal muscles + diaphragm contract pressure in chest cavity expand lungs air into the lungs) o How does air travel from the lungs to the body and what we use it for? (exchange useful air that we just inhaled to useless air that we’re about to exhale with blood) o Float a piece of lung on water – if it had air in it, it’ll float, otherwise it’ll sink o Which parts are soft? Which are hard? Why? (need hard trachea etc not to collapse when we’re asleep or when we’re swallowing, to make it easier for the air to reach lungs; soft lungs to make sure they can expand and contract) 3. Making a model lung (20 min) http://www.scribd.com/doc/3394749/lung-model-with-two-lungs-and-diaphragm-lab Cut the bottom of a 1l bottle with scissors Attach a balloon to the plastic tube with a rubber band. This will be trachea + lung Stick the balloon into the bottle, seal the space between tube and bottleneck with clay Cover the bottom of the bottle with another balloon, tie a knot on it. This will be the diaphragm Pull on the diaphragm pressure inside the bottle will be reduced and lungs will expand – this is what happens when we inhale If there’s extra time: test 2 lungs in the same bottle, using 2l instead of 1l bottle LUNGS and BREATHING (also called RESPIRATION) 1. What do our lungs do? 2. How does air travel in our bodies? 3. How much air can fit in our lungs? (Remember intro lesson!) 4. Label parts of the respiratory system: LEFT LUNG (2 LOBES), RIGHT LUNG (3 LOBES), DIAPHRAGM, TRACHEA, NOSE, THROAT QUESTIONS FOR LUNG DISSECTION: Which lung is bigger: right or left? Why? Why is trachea hard, and lungs soft? Why are trachea walls made of rings, instead of solid bone? (Hint: think of what happens when you swallow) Lungs don’t look like empty bags – where does the air go, after it leaves trachea? What happens when we inhale? When we exhale? Think about how diaphragm moves down/up and our chest expands/contracts. If you took a piece of lung and dropped it in water, would it sink or float? Why?