Which statement about hormones is correct?

Which statement about hormones is correct?

• A. Hormones are signaling molecules that regulate processes
• B. Hormones are structural components of tissues
• C. Hormones are enzymes that catalyze reactions
• D. Hormones are storage molecules

Answer: (A)

Hormones are signaling molecules that regulate processes. They’re produced by endocrine glands, travel long distances through the bloodstream, and bind to specific receptors on target cells to modulate activities such as metabolism, growth, and development. This regulatory signaling role is what sets them apart: they aren’t structural components of tissues, they aren’t enzymes that speed up chemical reactions, and they aren’t storage molecules like glycogen or fats. For example, insulin helps control blood glucose by signaling cells to take in sugar, illustrating how hormones coordinate physiological processes rather than serving as building blocks, catalysts, or storage forms.

Hormones are signaling molecules that regulate processes. They’re produced by endocrine glands, travel long distances through the bloodstream, and bind to specific receptors on target cells to modulate activities such as metabolism, growth, and development. This regulatory signaling role is what sets them apart: they aren’t structural components of tissues, they aren’t enzymes that speed up chemical reactions, and they aren’t storage molecules like glycogen or fats. For example, insulin helps control blood glucose by signaling cells to take in sugar, illustrating how hormones coordinate physiological processes rather than serving as building blocks, catalysts, or storage forms.