Shallow Water Blackout, Hyperventilation & O₂ Toxicity | PADI IDC Physiology Exam

Everything you need to know about respiration and oxygen physiology for the PADI Divemaster and IDC exams — Greek word roots, dead air space, involuntary vs voluntary hyperventilation, shallow water blackout, and CNS oxygen toxicity. Timestamps: 0:58 Greek roots — hyper, hypo, capnia, oxia, baro 4:06 Why CO₂ controls the urge to breathe (not oxygen) 10:33 Dead air space and why shallow breathing is dangerous 20:47 Involuntary hyperventilation — the vicious cycle 21:18 Voluntary hyperventilation — what freedivers do and why it's dangerous 24:29Shallow water blackout — the falling partial pressure explained 29:28 CNS vs pulmonary oxygen toxicity Full study notes for this topic (with exam traps called out): https://goprocaribbean.com/physiology-1 Complete PADI IDC dive theory resources: https://goprocaribbean.com/divetheory ───────────────────────────────────────── Go Pro Caribbean — PADI Platinum Course Director Will Welbourn Roatan, Honduras | 500+ instructors certified since 2008 Monthly PADI IDC courses year-round https://goprocaribbean.com