Why are humans described as mechanical mixtures?

Humans are described as mechanical mixtures because their bodies consist of various distinct substances and components that retain their individual properties while functioning together. This includes elements like water, proteins, fats, and minerals, which do not chemically bond but are physically intermingled. Unlike chemical compounds that undergo a transformation, the components in humans work in a coordinated manner, much like the parts of a machine. This characterization highlights the complexity and intricacy of human physiology without implying a uniform chemical composition.