OCR A-level PE - Gaseous Exchange

Physical education teaching is our speciality! This video will teach you all about gaseous exchange at both the alveolus and the muscle. This video is relevant for OCR linear GCE (A-level) PE Paper 1.
This video covers:
Gaseous exchange at an alveolus.
Capillarisation at an alveolus.
Net movement of gases at an alveolus.
Concentration gradient at an alveolus.
Gaseous exchange at muscle tissue.
Capillarisation at muscle tissue.
Net movement of gases at muscle tissue.
Concentration gradient at muscle tissue.
This videos is also available on TheEverLearner... where you will find the entire OCR linear GCE (A-level) PE course along with thousands of self-marking questions including the capacity to practice full exam papers online for OCR linear GCE (A-level) PE.
James is a PE teacher of 17 years' experience and is the most watched PE teacher in the world having recorded over 5.5k videos all about PE. James specialises in the teaching of GCSEs, A-levels, BTEC and other PE-related qualifications.
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I don’t really get this