I don’t think you’re looking for a part but I believe you’re looking for blood, more specifically the red blood cells
Answer: Overload
Explanation: because he lifted heavier weights now he is in pain.
Answer:
You see it all starts GÒOGLE IT
Answer:
I advice you take a healthy diet instead
Answer: Stress is somethings that happens when your overwhelmed or pressured
Explanation: Its different from anxiety because anxiety is the reaction to having stress. There can be different types of stress