Final answer:
The correct answer is b. The skin's functions include temperature control, protection, sensory perception, and synthesizing vitamin D when exposed to UV light, but not synthesizing vitamin K.
Step-by-step explanation:
The functions of the skin include all of the following except synthesizes vitamin K. The skin does not synthesize vitamin K, which is instead produced by bacteria in the intestine and plays a critical role in blood clotting.
The primary functions of the skin involve temperature control, acting as a barrier for protection against environmental hazards, aiding in sensory perception, and synthesizing vitamin D when exposed to UV light. It prevents water loss, serves as a barrier to microorganisms, helps to regulate body temperature through sweat and blood vessel dilation, and provides sensory information about the surrounding environment. Additionally, it has a role in synthesizing vitamin D, essential for bone health and other metabolic processes.