When atrial pressure is greater than ventricular pressure, the valves open?

Brian said that when you get your body broken such as a arm or leg. it means your bones break to pieces and must do surgery or get a cast to fix it.is it true or false?

What kind of wound occurred when the skin scrapes against a hard surface and tiny blood vessels break in the outer layer of skin

Which of the following is not a symptom of chronic fatigue syndrome