Further physiology

Further options

Quick quiz? on physiology

arrow_rightImmediate thoughts for students?

Feedback memo while you remember it!



The active cycle of breathing technique (ACBT) is a three-stage process for clearing sputum whilst Breathing dynamics shows how rib movement creates the conditions for breathing and breathing and gas transfer introduces the alveoli


1: Relaxed breathing

The first stage: The process is gentle and rhythmic and a hand on the chest may help. (note that the lungs, at the point of full in-breath, diffuse the gas exchange of oxygen from alveoli into the blood vessels and, similarly, carbon dioxide diffuses back into the alveoli when gas pressure is lowest and the lungs are contracting).


2: Deep breathing

Also called 'thoracic expansion': Deep breathing involves holding the breath for a second or two (if possible) to encourage diffusion (or transfer of oxygen within the alveoli). After deep breathing, a few more relaxed breaths are recommended before continuing to the third 'huff' stage.


3: The huff

The critical stage: The huff is the point when the sputum is released, however if release is only partially successful, simply relax and repeat the three steps.. it is a process and not a test!