4. If the skin is subjected to friction, layers of the epidermis may be separated, and tissue fluid will collect from the area and form a blister.
5 . a. ) Langerhans cells are found in the epidermis but have come from the bone marrow
b.) When Langerhans cells phagocyte pathogens, they carry them to lymphocytes (Type of WBC) found in lymph nodes.
c.) In response to the pathogen, the lymphocytes initiate an immune reaction such as the production of antibodies
d) Antibacterial chemicals produced in the epidermis are called Defensins
6. a) Melanocytes produce the protein Melanin, which is a pigment.
b) What is the stimulus for increased melanin production? Ultraviolet Rays
c) Explain the function of melanin (NOT to give the skin color). Melanin is a pigment that is produced by cells known as melanocytes in the skin of most animals, including humans. This pigment comes in different shades, depending on the genetic makeup of the individual. Melanin comes in two basic forms and can range from yellowish-red to dark brown.
-Mabel <3