What is a good biology experiment on/for human physiology?
Here are two that involve your venous system – really easy. 1. Stand up. Keep you arms down. You should see the veins on the back of you hands kind bulge out. Now slowly raise one of your hands. You’ll notice that as you raise it the bulging decreases until there is none around the level of your heart. If a person has high blood pressure, then they may still have the bulging at the heart level and need to raise it higher to flatten out. This shows that there is a slight pooling of blood due to gravity. And that as you raise your hand the drainage is better. 2. Now, why isn’t there more blood pooling. Because you have check valves in your veins that prevent back flow. You can see this. Again, with your hand low enough to see the bulging veins, press your finger (from your other hand) on a bulging vein that at the end closes to your upper arm. Run your finger along the vein toward the fingertips. You see the vein flatten out, this may take a little practice, to get good at. It flattens o
