Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
The pulse oximeter idea. The oximeter has a light-emitting diode on one end, and there is a phototransistor on the opposite end of the oximeter. Light-emitting diodes alternately emits red and infrared light, and part of the light will be absorbed after it passes through red blood cells in the blood vessels of the finger.
