These interactive flashcards help IB Psychology (First Exam 2027) students Standard Level (SL) and Higher Level (HL) quickly review and memorize the essential definitions, formulas, and terms needed for success in IB Exams. Each card focuses on 2.1.4 Chemical Messengers and is aligned with the IB Psychology (First Exam 2027) syllabus, ensuring focused revision on cognitive processes, biological bases of behavior, and research methods. Students can test themselves anytime, anywhere, perfect for reinforcing tricky concepts, learning IB terminology, and committing formulas to memory. By using RevisionDojo's flashcards consistently, learners turn repetition into mastery and enter the exam with confidence.