National Pool Lifeguard Qualification (NPLQ) Practice Test

Fainting, or syncope, refers to a temporary loss of consciousness caused by a reduction in blood flow to the brain. During this event, the brain does not receive enough oxygen, which can lead to a short period of unresponsiveness. This is often the result of various factors, such as dehydration, standing up too quickly, or emotional stress, which can cause blood vessels to dilate or blood pressure to drop.

In contrast to other conditions listed, fainting typically resolves quickly once the individual is placed in a position that improves blood flow to the brain, such as lying down. Dizziness might be a symptom associated with a lack of blood flow but doesn't specifically indicate a reduction in supply. A seizure involves abnormal electrical activity in the brain and is not primarily caused by decreased blood supply. A stroke, on the other hand, results from a more permanent interruption in blood supply, typically due to a clot or a burst blood vessel, leading to lasting damage or effects.