What are the cells in the epidermis that are part of the immune system?

The answer to the question: What are the cells in the epidermis that are part of the immune system? would be: Langerhan cells, which are the resident immune skin cells, but studies have also shown the presence of other immune cells on the stratum basale and the stratum spinosum, mainly T lymphocytes, especially CD8+.

Explanation:

Given the huge importance of the skin as the most important barrier between the human vunerable body, and the outer environment, especially as the barrier against invading microorganisms that could destroy the body, it is almost expected that this huge organ should count with its own resident system of immunity. And this has been found in several studies. At first, it was believed that the cells responsible for immunity on the skin, were the cells of Langerhans, but now, it is known that although these are the resident immune cells par excellence, there are also T lymphocytes, mainly CD8+ that also patrol between the stratum basale and stratum spinosum of the skin.

activation of phospholipase c (plc) indirectly increases intracellular ions through inositol triphosphate (ip3).

answer:

i don't believe the ocean is purple, but it might once have been:

as for the sky, according to nasa:

"sunlight reaches earth's atmosphere and is scattered in all directions by all the gases and particles in the air. blue light is scattered more than the other colors because it travels as shorter, smaller waves. this is why we see a blue sky most of the time."