As the title mentions, don’t tourniquets just stop the blood completely, or do they direct the blood to where they should go?
Also, how does it work in the case of amputations?
These may be stupid questions…
In: Biology
The tourniquets spot blood from passing that point. There are potential problems of tissue that is life and after is not getting enough blood, it can be a problem for reservation of the limb. Skeletal muscles will survive 1 to 1.5 hours with no oxygen. The huge problem is if the leading is from the head because your brain starts to get damaged after around 1 minute with no oxten.
The circulatory system is a double-branching tree. It is a bit like the electrical grid where on a small scale it is usually like that. If you disconnect a house other houses are not affected. If a small transformer station is damaged stuff after is affected but not the rest of the grid. On a large scale, the power grid is a grid. Electrically you could sally that there are lost of parallel not series connections
The blood from arteries via arterioles and capillaries to veins and then back to the heart. The change between arteries to veins is a relative sort distance.
Look at a high-level level view of the circulatory system at https://upload.wikimedia.org/wikipedia/commons/2/29/Circulatory_System_en.svg If you put a tourniquet on the upper arm it is only blood to the rest of the atm that gets blocked not to the rest of the body. You will see that split to smaller arteries and veins usually further down the limb so you do not block very much above the tourniquet
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