<span>The option that best describes their heart rates during this activity is A. low. They aren't doing much at that particluar moment - they are just walking around, talking and laughing. There isn't much there to rise their blood pressure and thus heart rate, which remains low. Moderate, vigorous, and dangerous heart rates would require much more vigorous activities. </span>
A). If you get sick, you have a weakness within the immune system that causes you to have the symptoms of the illness as the white blood cells are failing in getting rid of the illness itself.
Tendons connect muscles to bones
