Pulse oximeters use light to measure how much oxygen is in a person’s blood. For most people, a normal pulse oximeter reading is between 95% and 100%, researchers said in background notes. Readings ...

Neural tissue normally dies quickly without oxygen. Yet bird retinas—among the most energy-demanding tissues in the animal ...

The discovery fundamentally changes the understanding of a structure in the avian eye that has been misinterpreted for centuries.

"What is good for the heart is good for the brain," one researcher says.

Reduced blood flow to the brain is thought to be a key factor in many forms of dementia, including Alzheimer's, and ...

Bird retinas survive without oxygen by burning sugar scientists solve 300 year mystery that could help treat human strokes.

Numerous studies have shown COVID infection ups the risk of heart problems, including heart attacks, strokes, damage to the ...

Courtney Coco was found dead in 2004 nearly 200 miles from her Louisiana home, but it would years to unravel the complicated ...

A new study explains why current brain theories fail to fully explain near-death experiences and consciousness.

When you’re short on sleep and your focus suddenly drifts, your brain may be briefly slipping into cleanup mode. Scientists ...