Now the keratinocytes continue to move up along the epidermis and as they move deeper and farther up along the epidermis, they slowly begin to die off. And that's because the epidermis doesn't actually contain any blood vessels. And that means as the keratino sides move higher up, they cannot actually obtain the nutrients needed to actually continue living. And so that's exactly why they eventually lose their nuclei and the organelles and they die. They become nothing but bundles of keratin. And carotene is very important in not only giving our skin its strength, but also making the skin impermeable to water.