1. Visual function

The classic or earliest recognized function of vitamin A is to participate in maintaining the circulation of scotopic photosensitive substances in visual cells. The rod cells on the retina contain rhodopsin, which is composed of 11-cis retinal combined with opsin, and is sensitive to dark light.

2. Maintain the integrity of skin and mucous membranes

Vitamin A is a coenzyme that regulates glycoprotein synthesis. It stabilizes the cell membrane of epithelial cells and maintains the morphological integrity and function of epithelial cells. sound.

3. Nuclear hormone-like effect

Vitamin A regulates and controls the activation and expression of messenger RNA in the nucleus through retinoid receptors in the nucleus.

Extended information

1. The carotene in carrots can be converted into vitamin A in the body. It can be converted under the action of oxidase, and our human livers have it. This oxidase. Carrots are also very helpful in targeted moisturizing of the eye area. Therefore, carrots are also an excellent food for patients with dark circles to get rid of panda eyes.

2. Red-skinned and yellow-hearted sweet potatoes are rich in carotene, which is converted into vitamin A after being absorbed by the body, which has the effect of moisturizing the skin. In addition, sweet potatoes can also remove heat from the lungs and stomach in the body, produce body fluids to quench thirst, reconcile body fluids, and replenish the blood, thus restoring a healthy, rosy complexion to the skin.

3. Tomatoes are rich in carotene, which can be converted into vitamin A in the body. It has the effect of clearing away heat and quenching thirst, nourishing yin and cooling blood. It can help smooth skin wrinkles and restore skin to tenderness and smoothness. Therefore, people with dry and wrinkled skin can eat more tomatoes to restore the radiance and beauty of their skin.

Reference: Baidu Encyclopedia-Vitamin A