Vigorous exercise should provide a significant challenge to your cardiorespiratory system. select the best answer from the choices provided. t f

True

Explanation:

The vigorous exercise is a type of physical activity which is done with a great effort and energy. The intensity of exercise is more in the case of vigorous exercise. This leads to substantially high rate of heart function and rapid breathing.  

The vigorous exercise poses a challenge for the cardiovascular system as with the increase in intensity of exercise and efforts to perform the exercise the body muscles requires more amount of oxygen. The heart tries to pump more amount of blood so as to distribute oxygen along with blood to all the body parts. The muscles can only function and perform physical labor when the receive oxygen otherwise in the anaerobic condition in muscles the lactic acid will be produced which will be responsible for production of cramps and pain.

it hurts at first because " the cherry is broken" which is a thin layer of skin that breaks so the first time girls have sex it hurts and it bleeds but after the first time it does hurt again because the skin that ia torn does not break again/ grow back.