8 Automatic Body Functions (Hand-Drawn Explainer)

0:00–0:15 — HOOK Your body is doing hundreds of things right now… and you don't even have to think about them. Your heart is beating, your lungs are working, your brain is processing information—and that's just the beginning. Here are 8 things your body does without you consciously controlling them. 1️⃣ Your Eyes Blink Automatically You're probably not thinking about blinking right now. Yet your eyelids regularly close and open throughout the day. Blinking helps spread tears across the surface of your eyes, keeping them lubricated and helping clear away tiny particles. And here's the weird part: you can decide to blink, but most of the time, your body handles it automatically. 2️⃣ Your Brain Filters Out Your Nose Look down for a second. You can probably see your nose in your field of vision right now. But your brain usually ignores it. That's because your brain constantly filters information that isn't considered important. Otherwise, you'd be consciously noticing your nose every second of every day. 3️⃣ You Swallow Without Thinking Your body also swallows automatically. You consciously swallow when you eat or drink, but your body also makes thousands of tiny adjustments to manage saliva and keep your mouth and throat functioning normally. It's another example of your nervous system working in the background. 4️⃣ Your Heart Changes Its Rhythm Your heart isn't simply beating at exactly the same speed all day. Your nervous system constantly adjusts your heart rate depending on what you're doing. Sitting quietly, exercising, feeling stressed, or even sleeping can all change how quickly your heart beats. 5️⃣ Your Pupils React to Light Walk from a dark room into bright sunlight and something happens automatically. Your pupils become smaller. In darker conditions, they become larger. This happens without you having to consciously control them, helping regulate how much light enters your eyes.