1. Processes of the Respiratory System Parts of this powerpoint were taken from Mary Poarch science-class.net

3. Movement of molecules from an area of high concentration to an area of less concentration. Diffusion

4. Where is the amount of perfume the greatest before it is sprayed? What will happen once the perfume is sprayed into the classroom? Predict how long you think the scent will reach the other side of the room? Perfume Demo

5. the process of particles (solute) moving through a solution or gas from an area of higher amount to an area of lower amount. The areas are typically separated by a membrane. Concentration gradient

6. What does the term equilibrium mean?

7. Fill the beaker with fresh water. Place the beaker in a spot where it will not be disturbed. Drop three drops of food coloring into the beaker. Prediction: How long do you think it will take the food coloring to become evenly spread throughout the water? Food Coloring Demo

10. A membrane that allows only certain materials to cross it Materials pass through pores in the membrane Semipermeable Membrane

11. Balloon Diffusion 1. Pass the different colored balloons around to each group. 2. Record the “odor” of each colored balloon and compare observations. 3. Answer the following questions. a. How do “smells” get out of the balloon? b. Why is the balloon still full of air? c. How does this represent what happens in your lungs?

12. Humans obtain their oxygen by diffusion. But not through the skin Although the skin is well supplied with blood vessels, there are too many layers of cells for diffusion to be fast enough Humans have lungs and it is in these lungs that diffusion of oxygen and carbon dioxide occurs. Diffusion in the Lungs

13. position of lungs in thorax windpipe lung diaphragm heart human lungs Human lungs

14. the air passages in the lung branch into finer and finer tubes each tube ends up in a cluster of tiny air sacs. Lung Structure

15. blood supply to air sac air breathed in and out diffusion of oxygen diffusion of carbon dioxide O2O2 CO 2 A single air sac 0.03 mm