Summary Nephron diagram - homeostasis

This clear and highly visual study resource features a detailed, fully annotated diagram of the nephron tailored specifically for AQA A-Level Biology Unit 5 (Control in cells and in organisms). Designed to simplify one of the most complex structures in the syllabus, this document provides a step-by-step breakdown of how the kidney regulates the body's internal environment. The diagram explicitly labels and explains the precise homeostatic mechanisms occurring at each section: ultrafiltration in the Bowman’s capsule, selective reabsorption in the proximal convoluted tubule (PCT), water reabsorption in the Loop of Henle, and the final homeostatic control of water potential in the distal convoluted tubule (DCT) and collecting duct via ADH and osmoregulation. Packed with examiner-required terminology like counter-current multiplier, aquaporins, and hydrostatic pressure, this visual anchor is the perfect tool for mastering high-mark homeostasis questions in Paper 2 and Paper 3.