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# Changing Substances **Question 1:** **What process do gases A and B move across the membrane?** *Answer this question here.* **Question 2:** * **Feature of the lungs that gives a short diffusion pathway:** * **Feature of the lungs that gives a large surface area:** **Diagram Description:...

# Changing Substances **Question 1:** **What process do gases A and B move across the membrane?** *Answer this question here.* **Question 2:** * **Feature of the lungs that gives a short diffusion pathway:** * **Feature of the lungs that gives a large surface area:** **Diagram Description:** The diagram shows a cross-section of part of the lungs. Inside the lungs, there are small air sacs called alveoli. Blood capillaries surround the alveoli. The diagram shows the blood flowing in the capillaries, and oxygen is moving from the alveoli to the blood. **Question 3:** **Emphysema:** Emphysema weakens and breaks down the walls of the alveoli in the lungs. This causes lower energy levels during physical exercise. **Cause of this symptom:** *Answer this question here.* **Question 4:** **Structure of the small intestine for absorbing products of digestion:** Describe how the structure of the small intestine is adapted to absorbing the products of digestion. *Answer this question here.*