Physiology In quiet breathing, and in the supine position, where is the apex beat of the hea located? A To the left of the sternal angle at the level of the second rib B In the left fifth intercostal space in the midclavicular line C In the right midaxillary line D At the xiphisternal junction 💡 Explanation In quiet breathing, and in the supine position, where is the apex beat of the hea located? ✓ Correct Answer: B. In the left fifth intercostal space in the midclavicular line