Chemical messengers – IB Psychology Human Relationships Notes

IB Psychology revision notes on Chemical messengers in the Human Relationships context. Key concepts, research studies, and evaluation for the 2027 syllabus.

Mark Scheme SECTION A MARK SCHEME 4 marks Must Include: • Endocrine system and bloodstream transport • Slower/longer-lasting than neurotransmitters • Specific hormone e.g. oxytocin, cortisol • Origin gland e.g. hypothalamus, pituitary • Hormone level linked to social behaviour • Biobehavioral synchrony OR parental bonding example Link Formula: "Increased hormone levels facilitate behaviour, showing how the endocrine system regulates psychological process." Watch Out: Don't say hormones work "in ...