Homeostasis and coordination for N(A)-Level Science (Biology): homeostasis and the control of blood glucose, the nervous system and the reflex arc, and the structure and response of the human eye

An N(A)-Level Science (Biology) module overview of homeostasis and coordination. What homeostasis is and how insulin controls blood glucose by negative feedback, the nervous system and the reflex arc as a fast automatic response, and the structure of the eye and how it responds to light, with links to every dot point.