I just looked at the veins in my elbow with nothing but a thin layer of skin shielding them and then i bent my elbow and this thought came to me. Do our blood vessels get constricted when we bend our knees or elbows? If i kept my elbows constantly bent would my hands eventually stop receiving blood?
You know when you bend a hose that’s turned on and the water stops coming out? That’s kind of what i mean by this concept.
In: Biology
There’s enough “give” below the blood vessel to give it room to move. Also, there are major veins that go around the sides of the elbow, not just the middle.
If you’ve ever had your blood pressure taken, you’ll know how uncomfortably tight the cuff goes before it cuts off circulation. Bending your arm/leg is never going to reach that kind of pressure.
ETA: Getting a “kink in the hose” can happen when the vessel runs between bone. My friend had that happen to her subclavian artery, because of the geometry of her rib cage and collarbone. She got a massive thrombosis (blood clot) in her arm.
Our arms an legs bend, not fold. When a hose folds it cuts the liquid supply, when it bends the flow is uninterrupted.
There is too much going on in the limbs with bone, muscle, adamantium, cartilage, etc, to fold.
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