Describe what is happening in skin in response to sunlight

Question 1. Stratified squamous keratinizing epithelium is an excellent barrier to pathogens in the epidermis of the skin. Despite the fact that it is such a good barrier, this tissue would not be suitable for the lining of the trachea or small intestine. Explain why.
Question 2- Going out into the sun stimulates quite a bit of activity in the skin, especially on a hot summer day. Describe what is happening in the skin in response to the sunlight.

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