The arteries carry oxygenated blood away from heart and then re-takes it back to your system
Eccrin glands is one out of the two types of sweat glads that occur over most of your body and open directly onto the surface area of your skin. When your body tempature rises, your Eccrin glands secrete fluid onto the surface of Your skin, where it cools your body as it may evaporate.
The answer is D pulse oximeter
hope this helps
