Comparing peptide and steroid hormones, which pairing correctly matches class with receptor location?
- Peptide—intracellular receptor; Steroid—membrane receptor
- Peptide—membrane receptor; Steroid—intracellular receptor (correct answer)
- Peptide—nuclear receptor; Steroid—ion channel receptor
- Peptide—transport protein receptor; Steroid—extracellular matrix receptor
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, insulin binds membrane receptors, whereas cortisol binds intracellular ones. Choice B is correct because it accurately pairs peptide hormones with membrane receptors and steroid hormones with intracellular receptors. Choice A is incorrect because it reverses the pairings, suggesting peptide hormones use intracellular receptors, which is not the case. 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.