Class Test 1.3 Gas Exchange

Question 1

State the process by which gases and materials are exchanged in the lungs and in the tissues.

Answer 1

Oxygen is delivered by arteries to the capillaries that cover tissue, and because the capillaries are only 1 cell thick oxygen moves through the tissue easily using diffusion.

The tissues produce tissue fluid. Tissue fluid returns to the capillaries by osmosis. Waste products are carried by plasma to the lymphatic system.

Question 2

Describe the process of exchange in the lungs and tissues with reference to diffusion

Answer 2

Oxygen comes in through the lungs from the alveolus. The tissues need oxygen and glucose, and they produce carbon dioxide. The tissues get oxygen from the oxygenated red blood cells through the capillaries that carry it from the lungs, which is diffusion, and the glucose from the plasma. The tissues diffuse carbon dioxide into the deoxygenated red blood cells through the capillaries. The red blood cells carry it to the lungs, where they diffuse the carbon dioxide so the lungs can get it out of the alveoli.

Question 3

Citing cell. respiration, why do cells require O and release CO2?

Answer 3

• Glucose + Oxygen —> Carbon dioxide + Water + Energy
• Therefore, carbon dioxide requires oxygen to react with glucose. This means cells need oxygen to create carbon dioxide.