No one really understands how the respiratory system “knows” what the levels of O2, CO2, and H+ ion should be for us to survive.
To take control in a military operation requires the coordinated activity of a reconnaissance team, headquarters, and the soldiers in the field.
Obviously, it’s important for the driver to be aware of her car’s fuel situation.
Up until about fifty years ago, the final common pathway to death, no matter the cause, was cardiopulmonary arrest.
A single-celled organism is like a microscopic island of life, in that it can get what it needs to live from the surrounding water.
Because it must follow the rules, the cell needs many different innovations to be able to take control.
In this series so far, we’ve looked at what makes up the human cell and what it needs to do to stay alive.
There is a price to be paid by the body for thus battling the forces of nature.
Earlier we looked at what the human cell consists of and what it requires to live.
The residents of the city are slowly running out of food and water and are in desperate need of new supplies to stay alive.