Endocrine glands and hormones  classification of hormones, mechanism and effects of hormonal actions.   Hormones are classified as steroids, peptides, or amines based on: a) Target organs b) Chemical nature c) Solubility in water d) Molecular weight Answer: b) Chemical nature Explanation: Steroids (e.g., cortisol) are lipid-derived, peptides (e.g., insulin) are amino acid chains, and amines (e.g., epinephrine) are derived from tyrosine. Which hormone uses intracellular receptors and gene activation? a) Insulin b) Thyroxine (T₄) c) Adrenaline d) FSH Answer: b) Thyroxine (T₄) Explanation: Lipid-soluble hormones (steroids, thyroid hormones) bind…

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