Ultimately, the number of ammonia molecules moving out of the bottle will equal

Question

Ultimately, the number of ammonia molecules moving out of the bottle will equal the number of ammonia molecules, moving into it. When this point is reached, the ammonia molecules are said to have reached dynamic equilibrium When several kinds of molecules are present, consider only one case of diffusion at a time, even though several different types of molecules are moving. For example, consider the exchange of gases between the lungs and blood. In the lungs, a series of tubes transports gases. These tubes divide in to smaller and smaller branches and eventually end at a series of small alveolar sacs. Adjacent to these sacs are a number of capillaries containing blood. By the process of diftusion, there is an exchange of oxyge sacs and the blood in the blood vessels. n and carbon dioxide between the alveolar Lungs Vein leaving lung 79% 6% 02- 20% 14% 1. Is the direction of net movement of carbon dioxide molecules from the artery to the lungs or from the lungs to the artery? Hint: Your body is trying to get rid of the CO Explain your answer in regards to diffusion. 2. Is the direction of net movement of oxygen molecules from the vein to the lungs or from the lungs to the vein? Hint: Your body is trying to gain the Oz Explain your answer in regards to diffusion Another example of diffusion is sugar dissolving in water. When sugar molecules and water molecules mix, a solution is created. A solution is any mixture where two or more different types of molecules are evenly dispersed throughout the system. 3. Draw an arrow on the figure below to show the net direction of sugar movement. Figure 3 (next page) shows a selectively permeable membrane. A selectively permeable membrane is a thin sheet of material that selectively allows certain molecules to c prevents others from crossing. The membrane in this figure is permeable only to water molecules. Water molecules may freely diffuse across the membrane, but other types of oss but 25

Explanation / Answer

1) The concentration of carbon dioxide is more in the artery entering the lungs than in the lungs. Diffusion is the process of movement of particles from a region of higher concentration to lower concentration. So, there is a movement of carbon dioxide from artery to the lungs so that it gets expired out of lungs.

2) Similarly, the diffusion of oxygen is from lung tissues into the veins leaving lungs.

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