Which tissues in the human body do not need oxygen?

There are two primary tissues in the human body that do not require oxygen. The first is the corneas that are in the eyes. This part of the eye is transparent and it covers the front part of the eye. Overall, it covers three main portions of the eye, which are the pupil, iris, and the anterior chamber. The purpose of the cornea is to bend light.

The other tissue that does not require oxygen is the outer layers of the skin. These layers can range from 10-30 layers and it can shed. These layers of the skin can also die.

The cornea of our eyes is one of the few parts of your body that does not have blood vessels delivering oxygen to it, along with tooth enamel, hair, and nails. If the cornea did have oxygen, the blood vessels would prevent the light from entering, and you would not see clearly.

The cornea needs to be visible so that there can be no blood vessels there, otherwise, the light would be noticed. Without blood vessels, the cornea must obtain its oxygen from the atmosphere and the tears that naturally coat the eye. Oxygen dissolves in the eyes tears and then diffuses along the cornea’s surface.

The primary tissues in the human body that do not need oxygen are the corneas in the eyes and the outer layers of the skin. A cornea does not have blood vessels to carry oxygen because it if did, the blood vessels would block light from entering and you would not be able to see clearly. So, oxygen from the air is dissolved in tears and then the oxygen is distributed or spread throughout the cornea.

Also our skin is able to absorb a lot of the oxygen it needs directly from the air. According to a study published in The Journal of Physiology, "the upper skin layers to a depth of 0.25-0.40 mm are almost exclusively supplied by external oxygen, whereas the oxygen transport of the blood has a minor influence."