It's not really clear what you're asking about here.
BMX riding can be a bit dangerous. The rider is moving at speed, some height above the ground while trying to control a machine. Height and speed means that the chance of hurting yourself is bigger when falling off a BMX than if you'd simply stumble when walking.
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There are many dangers in the sport of extreme Mountain Biking. The main danger is there is severe risk of serious injury when falling from the bike and your whole body is at risk as you can only protect so much.
breaking bones and getting hurt really bad or falling of something or getting a bike part jabbed into you. But if your gonna start biking go for it its a whole lot of fun.
Basically that you can fall in a number of different ways, which can get you injured.
Yes, they provide you with helmets, knee pads, etc. If someone has an accident immediate medical attention is given.