Red blood cells are found in blood vessels!
Answer:
True
Explanation:
When you exercise, your body releases chemicals called endorphins. These endorphins interact with the receptors in your brain that reduce your perception of pain. Endorphins also trigger a positive feeling in the body, similar to that of morphine.
Answer:
The answer would be 4. just yourself
Explanation:
If you only have yourself for support then theres no system in place
