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- ... pass through into the lungs. Then the epiglottis closes off the windpipe, and simultaneously, the abdominal and ...
- ... share a membrane with the capillaries. That's how close they are. This lets oxygen and carbon dioxide ...
- ... to small veins, or venules. Lymph capillaries lie close to the blood capillaries, but they are not ...
- ... or danger. Let's examine an individual neuron up close. Here is a peripheral nerve. Each one of ...
- ... it's difficult to see things that are up close. Glasses with convex lenses narrow the plain of ...