How Digestion Really Works | Real Human Stomach & Small Intestine 3D Animation

Welcome to Anatomy Files, where science unlocks secrets. [music] >> Imagine you take a bite of a hot, cheesy pizza slice. But have you ever wondered what magical journey that slice takes [music] inside your body from the mouth to the stomach and small intestine? It's a scientific marvel that fuels your body and [music] powers your life. If you want to know how our stomach digests food, this video is for you. [music] Welcome to Anatomy Files, where we unravel the mysteries of the human body in a simple and fascinating way. So, how does our stomach digest [music] food? When we eat food, it embarks on a long complex journey through an approximately 30 foot long digestive [music] tract. This system is a powerhouse of our body, working silently every day. Its purpose is to extract nutrients like carbohydrates, [music] proteins, fats, vitamins, and minerals that fuel our cells for energy, [music] growth, and repair. The digestion journey starts in the mouth. And it's not just [music] about chewing. When you break food with your teeth, you turn it into smaller [music] pieces to make digestion easier. But the real science begins with saliva. Your mouth has three major salivary glands, [music] parotted, submandibular, and sublingual that produce [music] about 1 to 1 and 1/2 L of saliva daily. This saliva [music] contains an enzyme called amalayase, which starts breaking down carbohydrates. For example, if you're eating [music] a pizza or sandwich, amma converts its starch into simple sugars like glucose. This [music] process is so fast that the food might taste sweeter if you chew it longer. Saliva doesn't [music] just digest, it also softens and lubricates food to make swallowing easier. Plus, it protects [music] your teeth from germs and keeps your mouth clean. Then, when you swallow, the food travels through the esophagus to the stomach. The esophagus is a muscular tube that pushes food downward through a process [music] called paristalsis. Think of it like squeezing a toothpaste tube. All this happens in [music] just a few seconds and the food reaches the stomach's doorstep. Now we're in the stomach, the powerhouse of the digestive system. [music] The stomach is like a muscular sack that can hold about one liter of food. This is where the real digestion [music] happens. The stomach releases hydrochloric acid and enzymes like pepsin. [music] Hydrochloric acid is so powerful that it kills [music] germs in the food and prepares it for digestion. Pepsin [music] breaks proteins into smaller peptides. For example, if you eat a steak or chicken burger, its proteins start [music] breaking down here. The stomach's muscular movements mix and grind the food, turning it into a thick [music] liquid called kime. This process takes 2 to four hours, but if you've eaten a heavy meal, like a pizza [music] or steak, it can take up to 6 hours. The stomach's acidity, pH 1 to 3, makes it a machine that breaks down food and protects against germs. [music] But did you know the stomach produces a thick mucous layer to protect its walls from [music] this acid? If this layer weakens due to stress, spicy foods or excessive medications, [music] issues like ulcers or heartburn can occur. That's why doctors [music] always say, "Eat a healthy diet. Eat smaller portions and chew [music] well." From the stomach, kim enters the small intestine, the most critical part of digestion. The small intestine [music] is about 20 ft long, but its inner surface is so intricately designed that if [music] spread out, it would cover the size of a tennis court. Its walls have tiny villiike structures called villi which increase [music] nutrient absorption capacity 10fold. Three key players work here. The pancreas, liver, and gallbladder. [music] The pancreas produces enzymes like amalayise for carbohydrates, [music] lipes for fats and trison for proteins. The liver makes bile [music] which is stored in the gallbladder and released into the small intestine. Bile breaks fats into tiny droplets like soap removing oil stains so lipes [music] can digest them. For example, if you eat pizza with extra cheese, bile [music] breaks down the cheese's fats. In the small intestine, carbohydrates turn into sugars, proteins into [music] amino acids, and fats into fatty acids and glycerol. These nutrients [music] are absorbed into the blood or lymph and reach the body's cells where they're [music] used for energy, growth, and repair. This process takes 3 to 6 hours. But if the small intestine doesn't function [music] properly like in celiac disease where gluten causes damage [music] or lactose intolerance, nutrient deficiencies, abdominal pain or diarrhea can occur. For example, if you drink [music] milk and your small intestine doesn't produce lactase enzyme, you [music] might experience bloating or gas. That's why some people opt for lactosefree milk. So let's summarize. [music] Saliva in the mouth breaks down food. The stomach turns it into kime and the small [music] intestine absorbs nutrients. This system fuels our body. But if you [music] eat too many fatty foods or have small intestine issues, digestion [music] can be affected. That's why a balanced diet with fiber, protein, and healthy fats is crucial. So, that was the incredible [music] process of how the stomach and small intestine digest food. Comment with what [music] body mysteries you want to explore next and subscribe to catch more medical marvels with [music] Anatomy Files.