字幕列表 影片播放 列印英文字幕 Smart Learning for All What causes wrinkles? A witch's potion. No. Our skin consists of two important proteins called collagen and elastin. Collagen keeps our skin firm and tight. While elastin gives our skin flexibility and elasticity. It allows our skin to stretch, twist and contract. Just like an elastic rubber band, right? Absolutely. But as we age, our skin produces less collagen and elastin. Hence, our skin no longer remains firm. It begins to lose elasticity. As a result, our skin droops, thus causing wrinkles. Moreover, there are some factors that can cause early wrinkling. One of them is UV radiation of the sun. Long term exposure to UV radiation can cause collagen and elastin to break down faster than normal. Thus causing wrinkles in early age. Besides this, smoking and poor nutrition may also contribute to early wrinkling. For more educational videos, please download 'Smart Learning for All' Android App from Google Play Store. Also, don't forget to subscribe to our YouTube channel.