hypertrophy
One thing that increases in our muscles when we exercise is lactic acid.
It happens when your body has no other energy to use apart from lean muscle tissue, it usually occurs during long periods of cardio (about an hour +) or when you don't have sufficient nutrient intake, like enough carbs, your body will result to using muscle.
Increased heart rate.
A response is an action of change in behavior that occurs as a result to a stimulus. The stimulus can be either internal or external.
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Existing muscle cells increase in diameter.
One thing that increases in our muscles when we exercise is lactic acid.
No. You can loose muscle by poor diet, but excercise increases muscle.
Hypertrophy
Ossification
Reflex action
atrophy
Yes.
Hypertension
Over training occurs when you do more exercise than your body can handle.
Muscle cannot turn into fat, because one tissue cannot evolve into another. What does happen is that a loss in activity results in the shrinking of muscle mass because of disuse. Also, fat levels may increase because a loss of activity may result in a surplus of calories, which can result in an increase in fat. So, after not working the body for a while, muscles may shrink and fat may increase and can result in looking less firm (loss of muscle) and more flabby (increase in fat).
Cellular Respiration