Final answer:
The functions of the skin include maintaining water balance, regulating body temperature, providing protection against microorganisms, synthesizing vitamin D, and sending sensory information to the brain. The production of key antibodies is not a function of the skin, as antibody production occurs within the immune system.
Step-by-step explanation:
The functions of the skin include maintenance of water balance, regulation of body temperature, protection from microorganisms, synthesis of vitamin D, and sensing information to convey to the brain. However, the production of key antibodies is not a function of the skin; this takes place in the immune system where cells like lymphocytes produce antibodies. The skin does house some immune cells for protection, but it does not create antibodies.
The skin's primary functions involve acting as a barrier to prevent water loss and microbial entry, assisting in thermoregulation through sweat production and blood vessel dilation or constriction, synthesizing vitamin D in the presence of UV light, and providing sensory information through nerve endings. The skin also produces melanin, which serves as protection against UV radiation.