Why do you wake up with a morning erection? It's not always due to a dream. Jonathan from the Institute of Human Anatomy dives into the fascinating anatomy and physiology behind the "wake-up call" known as Nocturnal Penile Tumescence (NPT), revealing whether these nightly events are a thumbs up or a red flag for your overall reproductive health. This video breaks down the roles of your brain, hormones, and incredibly fast blood flow —a physiological response that can cause a full erection in as little as 5-10 seconds. We use anatomical detail to examine the internal structures (the corpora cavernosa and corpus spongiosum) and explain how nitric oxide acts as a powerful vasodilator to oxygenate penile tissues. Discover the female equivalent, nocturnal clitoral tumescence, and learn what the sudden absence of NPT might signal, such as low testosterone or vascular problems
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Institute of Human Anatomy
