The Primary & Secondary muscles of Respiration

In this episode, we explore the muscles responsible for ventilation or breathing. Those primarily responsible for expanding the thorax and indirectly the lungs and those that can be recruited when forcefully trying to do so. What are they, where are they and how do they work? 

Terms covered in this episode; Respiration, ventilation, primary and secondary muscles of respiration. The diaphragm, intercostal muscles and Boyle's law.