Final answer:
The statement associating poppy juice with endogenous endorphins is false because endorphins are produced within the human body, while poppy plants contain morphine and other opiates, not endorphins.
Step-by-step explanation:
The statement 'Juice of poppy Endogenous endorphins' can imply that poppy plant derivatives contain endorphins, which is false. Endorphins are endogenous opioid neuropeptides and peptide hormones in humans and other animals. They are produced by the central nervous system and the pituitary gland. The primary opioid of interest in the opium poppy is morphine, which can be further processed into drugs like codeine and heroin. Endorphins and morphine-like compounds serve to alleviate pain, but endorphins are produced within the body, while morphine is a plant-derived product. Notably, endorphins are responsible for pain relief and feelings of pleasure that can be triggered by various activities such as vigorous exercise.