V/Q mismatch and A-a gradient | easy explanation for USMLE STEP 1 | respiratory physiology

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* this video covers almost everything you can expect from V/Q mismatch and A-a gradient on usmle step 1. * this topic is also given in first aid 2015 on page no. 606 and page no. 614 in first aid 2016. *At 10:43 i said ZONE 3....it should be ZONE 2. * if you are first or second year medical student or if you have more than one year to prepare for usmle step 1 or any other exam then i strongly recommend you to watch dr. najeeb lectures to make your concepts very clear. If you don't have enough time to prepare for usmle step 1 then i would not recommend you to go through every video of dr. najeeb . just watch neurology and immunology.