Ldk I’m not cristian and I don’t believe in god, and this is only what some people believe you have to do, it is not necessarily true, there is no proof of it or facts, so please believe what you want and in the end you will be fine as long as you have enjoyed life.
Where's the choices?? But anyways cardio has to do directly with the heart and it's pace if I do crunches that is NOT cardio respiratory it's neither cardio respiratory hope this helps
Answer:
There are 2 Valve Systems
Explanation:
The mitral valve and tricuspid valve are located between the atria (upper heart chambers) and the ventricles (lower heart chambers).
