Let's look at this item-by-item.
First, your blood carries oxygen, so if you have less blood, it takes longer to carry the same amount of oxygen.
Next, when you are short of blood, which is life, your body begins furiously making more blood to replace what was lost. This is hard work and is also a priority to your body, so other parts of your body sacrifice to make that blood. A correlation is why people get frostbite when in the cold, besides exposing fingers and toes to the cold. Your body sends blood to protect your vital organs. That means less warming blood is around the toes and hands, so they get colder than the rest of your body. Same thing when you bike...the body sends more blood to the legs which makes it tough to immediately do something else when you finish biking until you get the blood moving back to other areas.
I'm sure someone out there has more or will correct me if I'm wrong on something here!
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Stangers have the best candy.
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