Calcium deposits in her arteries? Wow, I don't even know how that would happen. But, then, I'm not a doctor and I don't even play one on TV

I'm hypertensive and just recently had a stress/echo to see how my BP reacted to high levels of exertion (which turned out to be a lower level than what I was doing on my bike. Go figure. Call it ignorance on my part). That's when the cardio set my limit. I had no idea