Answer: The Mitral and Tricuspid valves control blood flow in the heart
Explanation:
Do they work you mean?? Different variations of the position of your hands hits different muscle parts. Like doing push-ups with your hands far apart hits more of the chest area. Doing them with your hands close hits more of your triceps. I personally like them close.
Answer:
The answer is allowing young children to play with small toys.
Explanation:
Look at your R-R ratio, depending on the time segment attributed to each square you can then do the math and find time between waves, then find the number of R waves in minute
