Scribble this out, external and internal environment want to interact with one another. How they do it is what it's all about.
You can get yourself briefly acquainted with enzymes and vitamins and dorky homeostasis by infographics on YouTube study videos.
Like this one.
As for externals, we've mostly society. Repeated stimulus like ads, rules and regulations biting us on do's and don't 's as if Super Ego and Ego weren't enough. Throw in specifics like definitions and dates, draw a picture for better explanation and you're more than okay to go!!
YOU ARE READING
KAHL'S guide to physiological psychology
Randomsome hacks and tricks and notes for exams on the said subject.
