system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does an elevated pulse from anger/anxiety contribute towards heart problems, but during exercise a fast pulse is healthy?

I recently had a terrible disagreement with someone and everytime I think about it I start shaking and my heart starts pounding from adrenaline, which according to Google is unhealthy. But our hearts are accelerated when exercising, which is supposed to be a good thing - so what is the difference?
gpt
Think of your blood vessels as the plumbing for a house. Exercising requires blood to flow to different muscles, much like opening up multiple water valves in a house to turn on the sprinklers, wash clothes, run the dishwasher, and take a shower at the same time. More water gets pumped from your water main (heart) to do all those things.

When you're stressed or angry, without doing anything, the blood pressure has no where to go. It's like having more water pressure in your plumbing pipes without any exits. Over time, this can damage the pipes and lead to bigger issues. Chronic high blood pressure can injure your blood vessels.

This is why exercise is a good thing to do when you feel stressed or angry as an outlet for your increased heart rate and blood pressure.