№15. Physiology of HNA (higher nervous activity) I. Unconditional and conditional reflexes. Alarm systems. Practical lesson plan 1. Concept of higher nervous activity. 2. Unconditional reflexes: characteristics and classification. 3. Conditional reflexes: formation and mechanisms. 4. Inhibition of conditioned reflexes. 5. Signal systems (first and second). Control questions 1. What is higher nervous activity? 2. What are unconditional reflexes? 3. How are reflexes classified? 4. What are conditional reflexes? 5. How are conditioned reflexes formed? 6. What is reinforcement? 7. What types of inhibition exist? 8. What is extinction? 9. What are signal systems? 10. What is the role of speech in HNA?Answer this questions in detail of physiology in easy words for viva it should be little short because i have 2 topics for 1 viva and easy to understand too take the reference from Guyton Hall Sembulingam also