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  3. 1 oxygen molecules pass from the air sacs of the...

Question: 1 oxygen molecules pass from the air sacs of the...

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1) Oxygen molecules pass from the air sacs of the lungs into the respiratory capillaries in less than 1 second. Likewise, carbon dioxide passes form the capillaries into the air sacs. What type of membrane transport is occurring here? What is the driving force?

2) In the small intestine, molecules of glucose must be absorbed by the cells lining the interior. These molecules are too large to pass through the phospholipid bilayer. How do you think absorption of glucose and other simple carbohydrate molecules is accomplished? Does the process follow a concentration gradient or does it require energy?

3) The Sodium-Potassium pump is utilized in many cells within the body and requires ATP (chemical energy) to function. In which DIRECTION (into the cell or out of the cell) are sodium and potassium transported when utilizing this form of active transport?

4) Predict what would happen if you place a raisin in a glass of water and left it overnight. What physiologic process occurred? Explain the appearance of the raisin and why it changed. Is the water considered hypotonic, hypertonic or isotonic based on your prediction?

5) You are a critical care nurse working in the ICU. Your patient fell from a rooftop and sustained a head injury that caused swelling around the brain. You are instructed to administer mannitol intravenously. Using resources of you choice, explain how the drug mannitol will reduce the swelling in the brain. be sure to include what membrane transport process is demonstrated by this drug.

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