Final answer:
The muscular system is used as a guide for applying makeup by cosmetologists. The safety and regulation of cosmetic products are monitored by industry experts and the FDA, which has a broad definition of cosmetics that includes a variety of products meant to enhance or alter appearance.
Step-by-step explanation:
The muscular system provides physical markers that guide the placement of different products when a cosmetologist is applying makeup to a client's face. Cosmetology involves the use of various products such as lotions, perfumes, and accessories, often influenced by the beauty industry's drive to create new fashion necessities. Regulatory agencies like the FDA play a significant role in the safety of these products, which are defined broadly as items applied to the human body to cleanse, beautify, or alter appearance.
Historically, cosmetics have been used for thousands of years, with ancient Egyptians and Sumerians being among the early adopters of makeup for enhancing their appearance. Furthermore, experts in cosmetic ingredient reviews monitor the safety of beauty products, though they do not have legal authority. This information highlights the intricate interplay between the beauty industry and regulatory bodies when it comes to the development and application of makeup.