During exercise, the muscles get stronger and the bone mass gets larger.
The muscle cells burn off ATP (Really fast) and they get much tighter to deal with the strain. Make sure that you always stretch and warm up before running as the muscles could strain!
It's fibers get thicker and stronger
During exercise muscle cells use oxygen.
the muscles produce lactic acid which then relieves the muscles but it results in muscle cramps
Fermentation in muscle cells produces lactic acid. This happens when you have overworked your muscles, which can happen during exercise.
after a long period of exercise a muscle can cramp
We burn calories and make muscle.
You will see muscle development after exercise, not during.
Yes. Strenuous exercise can kill the muscle fibers. Such muscle fibers are replaced by fibrous tissue.
They atrophy
During intense physical activity, glycogen; which is energy stored in muscle cells, is used during intense muscle contractions.
It comes naturally as you exercise and train your muscle over time.
Exercise causes the muscle to break apart. When your body repairs this damage, new muscle tissue is made. This causes the muscle to grow over time
lactic acid