Chapter 208 of 2363 min read
Double circulation and disorders
Why this is asked: Double circulation exists because a four-chambered heart keeps oxygenated and deoxygenated blood from mixing — blood crosses the heart twice per cycle, once via the pulmonary route and once via the systemic route. NEET's disorder questions hinge on the exact numbers: normal blood pressure is around 120/80 mmHg, and a sustained reading at or above 140/90 mmHg marks hypertension.
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