Question

which statement best describes hormones?
hormones are only made of peptides.
hormones travel attached to white blood cells.
hormones travel through the bloodstream.
hormones are secreted through ducts.

Explanation:

• Option 1: Hormones can be peptides, steroids (e.g., testosterone), or amines (e.g., thyroxine), so they aren’t only peptides.
• Option 2: Hormones travel freely or bound to transport proteins in the blood, not attached to white blood cells.
• Option 3: Endocrine glands secrete hormones directly into the bloodstream, which carries them to target cells. This matches the definition of hormones.
• Option 4: Hormones are secreted by endocrine glands, which have no ducts (exocrine glands use ducts). So hormones aren’t secreted through ducts.

Answer:

C. Hormones travel through the bloodstream.