Anatomy Question of the Day

1. They carry hormones through blood by binding plasma transport proteins
2. They amplify the signal inside the cell and activate enzymes (correct answer)
3. They convert steroid hormones into peptides for receptor binding
4. They store hormones in secretory vesicles until exocytosis occurs

Explanation: This question tests the understanding of hormone classes and their receptor mechanisms in an introductory Anatomy & Physiology context. Hormones are chemical messengers that interact with specific receptors to induce physiological responses. Peptide hormones generally bind to membrane-bound receptors, while steroid hormones typically interact with intracellular receptors affecting transcription. For example, in peptide hormone signaling, binding to a membrane receptor often activates second messengers like cAMP to amplify the signal. Choice B is correct because it accurately describes second messengers amplifying the signal inside the cell and activating enzymes after membrane receptor activation. Choice A is incorrect because it refers to transport proteins that carry hormones in blood, not second messengers involved in intracellular signaling. To help students understand, emphasize categorizing hormones by their structure and receptor type. Encourage the use of diagrams to trace hormone pathways and visualization of receptor locations.