system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 Why is blood slippery (like soap) when you wash it off, but otherwise sticky like glue?
gpt
Platelets in blood causes it to be sticky when dried on your skin. They pile together to close off open wounds and give the bleeding area a temporary gelatinous shield from foreign contaminants. Your platelets also work underwater, thickening and sticking to your skin. A bar of soap does a similar thing, sticking to your skin and slowly rinses off with more water.