With each breath, a human may inhale thousands of harmful microbes into the lungs. Mucus, the gel-like moist substance coating the airways, is one of the first lines of defense and aids in removal these microbes.
FDA urged to move faster to fix pulse oximeters for darker-skinned patients
The Food and Drug Administration should move more quickly to ensure pulse oximeters — the ubiquitous devices used to measure blood oxygen — work well