â¢ The critical path is defined as the longest path through the CPM network and consists of those activities. that determine the shortest time for project completion. Activities within this or list form a series (or. sequence) of logically connected activities that is called the critical path.
Time is very important when an unconscious person is not breathing. Permanent brain damage begins after only 4 minutes without oxygen, and death can occur as soon as 4 to 6 minutes later. Machines called automated external defibrillators (AEDs) can be found in many public places, and are available for home use.
Under relatively normal circumstances, we start struggling after a few minutes without oxygen. Without being able to convert energy and use it up, cells start to die. This happens throughout the entire body, but it is the brainâs lack of oxygen that is most urgent. âThe brain is a highly metabolically active organ,â Tishler said. âIt needs oxygen to generate the energy to function. Without the energy (without oxygen) it dies.â The brain normally takes up about 20 percent of the bodyâs oxygen. If it doesnât get what it needs, cells begin dying off, putting a person at risk of permanent brain damage. If a person suffocates, or suffers another type of involuntary oxygen deprivation, theyâll ultimately suffer brain death: the utter, irreversible loss of brain function. Itâs a pretty unavoidable succession of events.