This has to do with SURFACE TO VOLUME RATIO. For a typical small cell, its surface area to the volume ratio get smaller as the cell grows. This implies that, if the cell grows beyond a certain limit, then the amount of nutrients that entered the cell will be limited, that is , nutrients will not be able to migrate into the cell as needed. To avoid this, the cell has to divide to reduce its surface to volume ratio.<span />
Quackery<span> is the promotion of fraudulent or ignorant medical practices. A </span>quack<span> is a "fraudulent or ignorant pretender to medical skill" or</span>"a person who pretends, professionally or publicly, to have skill, knowledge, or qualifications he or she does not possess; a charlatan".
The brain represents 2% of the total body weight for a human. But it uses 20% of the total oxygen and calories absorbed by the body (so ten times more than its weight ratio) it proves that it is an important organ that need a lot of energy.
The brain is the seat of higher functions (cognitive functions, senses, nervous responses) and vegetative functions. It is, therefore, an essential organ that regulates all vital functions. Like a central unit in a desk computer, the brain receives information from the entire human body via afferent nerves, integrates and analyzes them, and responds by emitting new signals that descend to the parts of the body concerned by the efferent nerves.
