We need blood because it carries oxygen and helps us sustain life. The organ that pushes blood through the body is the heart.
The correct answer is A buildup of lactic acid in the tissues I think. I hope this helped dear:)
For the answer to the question above, I believe the answer is that the bones get or have a greater risk for bone fracture <span>if calcium is not replaced in bone tissue. The bones could become more brittle. For women, they can suffer from Osteoporosis. </span>