Changelog

November 2026

Corrected the Show Me tour of Animated Figure 7-6 (Acid-Base Compensatory Mechanisms): it said compensation never brings the pH all the way back to 7.40, but the metabolic compensation of a chronic respiratory alkalosis can
Reworded the first step of the anaerobic threshold tour of Animated Figure 9-2 (The respiratory system during exercise) so it describes the figure as it moves

Rebuilt Animated Figure 9-2, the anaerobic threshold and exercise ventilation (The respiratory system during exercise), as a live figure (drawn in your browser as you move the slider)
Added Show Me tours to Animated Figure 9-2: a tour of the diagram, and a tour that asks for your prediction before it shows what happens past the anaerobic threshold
If you are using an AI assistant that can see the page, whether it is built into your browser or opens the page in its own browser, it can now explain 9-2, change it, and take you through the tours (see the AI assistant section at the end of the page)
Rebuilt Animated Figure 3-1A, a pneumothorax (Lung volumes and the balance of forces), as a live figure (drawn in your browser as you move the slider)
Added a Show Me tour to Animated Figure 3-1A that walks through the diagram and asks for your prediction before it shows what happens when air gets into the pleural space
If you are using an AI assistant that can see the page, whether it is built into your browser or opens the page in its own browser, it can now explain 3-1A, change it, and take you through the tour (see the AI assistant section at the end of the page)

Rebuilt Animated Figures 5-8A and 5-8D (Oxygenation and the gas exchanger) as live figures (drawn in your browser as you move the slider)
Added Show Me tours to Animated Figure 5-8A (a right or left shift of the oxygen-hemoglobin dissociation curve) and Animated Figure 5-8D (hemoglobin level and anemia): a tour of each diagram, and a tour that asks for your prediction before it shows what happens
If you are using an AI assistant that can see the page, whether it is built into your browser or opens the page in its own browser, it can now explain 5-8A and 5-8D, change them, and take you through the tours (see the AI assistant section at the end of the page)
The oxygenation page now better fits when viewed on a phone, and its graphs redraw to fit when the window narrows

Rebuilt Animated Figures 7-1, 7-2, 7-3, and 7-5 (Primary acid-base disorders) as live figures (drawn in your browser as you move the slider)
Added Show Me tours to all seven acid-base figures, Animated Figures 7-1 to 7-7: a tour of each diagram, and a tour that asks for your prediction before it shows what happens
If you are using an AI assistant that can see the page, whether it is built into your browser or opens the page in its own browser, it can now explain the chapter 7 figures, change them, and take you through the tours (see the AI assistant section at the end of each chapter 7 page)
Wide equations now fit on a phone screen

October 2026

Added Animated Figure 6-3 (Slowly and rapidly adapting stretch receptors) to illustrate how SARs and RARs respond to a change in lung volume, with sound for each receptor's firings
Added Animated Figure 6-4 (Muscle spindles and load compensation) to illustrate how muscle spindles signal an increased load on the ventilatory muscles
Added Animated Figure 6-5 (Interactions between peripheral and central chemoreceptors), a narrated walk through the short-term responses to an added acid or base

Added the publication year (2025) and edition to the How to Cite citation on the About page

July 2025

🎉 Launched Interactive Animated Figures Directory with shareable links for all animated figures (39 so far)
All animated figures now have direct, shareable URLs for enhanced accessibility and citation

June 2025

Added Animated Figure 5-8C (Three Alveoli V/Q Matching) to illustrate ventilation/perfusion matching in three alveoli and the idea of V/Q mismatch

Added Animated Figure 5-8B (Single Alveolus V/Q Matching) to illustrate ventilation/perfusion matching in a single alveolus

Added Animated Figure 9-2 (Anaerobic Threshold and Exercise Ventilation) to illustrate the relationship between anaerobic threshold and exercise ventilation

Added Animated Figure 9-4 (The Fick Principle: Oxygen Delivery and Extraction) to illustrate oxygen delivery and extraction via the Fick Principle

May 2025

Added Animated Figure 7-6 (Acid-Base Compensatory Mechanisms) to illustrate how the body compensates for primary acid-base disorders

Added Animated Figure 7-5 (Metabolic Alkalosis) to illustrate primary metabolic alkalosis and its effects on acid-base balance
Added Animated Figure 7-4 (Anion Gap Explorer) - a new interactive tool for exploring anion gap concepts (not in print edition)

Added Animated Figure 7-3 (Metabolic Acidosis) to illustrate primary metabolic acidosis and its effects on acid-base balance
Added Animated Figure 7-2 (Respiratory Alkalosis) to illustrate primary respiratory alkalosis and its effects on acid-base balance

Added Animated Figure 7-1 (Respiratory Acidosis) to illustrate primary respiratory acidosis and its effects on acid-base balance

Added How to Cite section to the About page with proper citation format and auto-updating date