Answer:
When people lift weights, microscopic damage (microtears) occurs to the myofibrils within the muscle fiber. These microtears stimulate the body's repair response. ... The increased number of myofibrils causes muscle fibers to enlarge, increasing their volume and size.
Explanation:
Answer:
I would say B. digestive system.
Explanation:
The digestive system breaks down food and processes it into energy molecules that the body of an organism can use.
Hope this helps! :)
