Building Muscles

Written by Science Knowledge on 1:09 AM

Muscle cells share one thing in common with the fat cells—they rarely multiply. The number of muscle cells you had at birth is the same number you have now. And there’s probably nothing you can do to change that.

Fortunately, you don’t need to increase the number of your muscle cells to gain strength—you simply need to beef up the ones you have. Oddly enough, the trick to building stronger muscles is to damage them, and the best tool for inflicting the gentle trauma you need is exercise.

Here’s how it works. When you exercise, the vigorous muscle contractions create microscopic tears in your muscle fibers. As your body repairs these tears, it stuffs in a bit more protein to make the muscle a little more resilient the next time. Repeat this process over the course of a year, and you have a recipe that gradually bulks up your muscle, making it stronger along the way.

Muscles don’t necessarily need to get bigger to get stronger. Studies find that exercised muscles develop a better blood supply, which gives them improved access to oxygen and lets them work longer before tiring out. They also respond more readily to the signals your brain sends them, springing into action more easily. Exercised muscle cells also get more mitochondria, which are the power plants of your body. They carry out the energy-producing chemical reactions that muscles need to contract. The net effect is that an exercised body gets a larger and more easily accessible energy supply.

There is one case when your body creates new muscle cells—if an existing muscle cell dies because of damage or disease. But this process has strict limits. For example, your body can’t repair certain types of muscle tissue or patch up extensive damage, and it may fill gaps with useless scar tissue. (This is what happens if you suffer a heart attack, in which case your heart is never the same again.)

Source of Information : Oreilly - Your Body Missing Manual

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In its broadest sense, science (from the Latin scientia, meaning "knowledge") refers to any systematic knowledge or practice. In its more usual restricted sense, science refers to a system of acquiring knowledge based on scientific method, as well as to the organized body of knowledge gained through such research.

Fields of science are commonly classified along two major lines: natural sciences, which study natural phenomena (including biological life), and social sciences, which study human behavior and societies. These groupings are empirical sciences, which means the knowledge must be based on observable phenomena and capable of being experimented for its validity by other researchers working under the same conditions.

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