Wednesday 22 March
The lungs and heart are attached, because the heart needs to pump blood into the lungs. To
inflate the lungs, we blow through the trachea, and they fill with air quite quickly, looking slightly like a balloon being blown up, then when the blowing stops, they slowly deflate. The trachea (a light pink tube) was cut off the heart, revealing the bronchi (white and firm), then they were cut off, leaving the bronchioles (light pink and squishier). The blood has valves on the surface, which help the blood flow through, but not backwards. We cut away the fat tissue, and muscle. The left hand side of the heart is thicker, because it needs to pump blood all around the body, and the right side is thinner, because it only needs to pump blood to the lungs.
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