So I’m a researcher in muscle protein metabolism. I can right out tell you that muscle hypertrophy exists. That’s is muscle fibres increasing in size. However, in humans muscle hyperplasia (the addition of new fibres) has not been demonstrated. It has in birds but not in humans. So neither of those responses are best. Please report back to your teacher and report that question as illogical. 1) muscle growth is not difficult to study in humans. We can use ultra sounds, MRIs to visually see how much muscle has grown and we can calculate muscle protein synthesis rates (how much protein is being synthesized into muscle and thus priming growth). 2) muscle hypertrophy is universally accepted as an occurring phenomenon. Look at body builders for extreme examples, and looks at studies published in the scientific journal called Nature (most reputable scientific journal ). Clearly a bodybuilders muscles are larger compared to the average individual. And we can say for certain it’s due to larger fibre sizes not the addition of fibres. 3) look up Dr. Nicholas Burd, Dr. Dan Moore, Dr. Stuart Phillips. All reputable scientists (dr. Stuart Phillips being the leading expert in muscle protein metabolism). 4) why does the Acceptance from the fitness community even matter when the experts tell you it exists. The Fitness community doesn’t really have a grasp of the molecular part of the muscle to explain or accept hypertrophy as fact. So, I apologize but I have no answer for you because none of those options are correct. Please educate your instructor.
The limbic system is the part of the brain involved in our behavioral and emotional responses, laughter for example, or aggression, as it is the case here. It controls some behaviors that are essential for survival: finding food, reproduction and self-preservation. It is a network of structures located beneath the cerebral cortex and above the brainstem. The two of the major structures of the limbic system are the hippocampus and the amygdala.
