Body systems rely on a balance of electrolytes, enzymes, and hormones like cortisol. Understand fat metabolism, urinary output, and energy system functions.
Cells are the simplest units of life. In some organisms, cells function as the complete living creature--bacteria, for instance, consist of only a single cell. In other organisms, many cells working together comprise the organism.
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Humans--and all other living organisms--need nucleic acids. The nucleic acids, which include deoxyribonucleic acid, or DNA, and ribonucleic acid, or RNA, encode genetic information and allow humans and other organisms to follow their genetic instructions.
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