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In your throat, the path for food and the path for air cross over — so swallowing has to route food safely past the windpipe. Label the tongue, soft palate, pharynx, epiglottis, windpipe and food pipe, and learn how the swallow protects your airway, in an interactive playground.

The liver is the body's largest internal organ and busiest chemical factory. Label the liver, gallbladder, bile duct, portal vein and hepatic artery, and learn how the liver makes bile, cleans your blood, and uniquely gets blood from two sources — in an interactive playground.

The liver is built from thousands of tiny repeating units called lobules. Zoom into one and label the liver cells, sinusoid, central vein, portal vein, hepatic artery and bile duct, and see how blood flows slowly past the worker cells to be cleaned — in an interactive playground.

The pancreas is a soft gland behind the stomach that both digests your food and controls your blood sugar. Label its head, body, tail, pancreatic duct and lobules, and learn how this two-in-one gland works — in an interactive playground.

The pancreas collects its digestive juice through a branching duct, like a river gathering tributaries, and pipes it to the gut — where it meets the bile duct. Label the pancreatic duct, a branch, the bile duct, the head and the tail, and see how the juice is delivered, in an interactive playground.

The gallbladder is a small pear-shaped sac that stores and concentrates the liver's bile. Label its fundus, body, neck and cystic duct, and learn how it holds bile between meals and releases it when you eat — and why gallstones cause pain — in an interactive playground.

The small intestine is where nutrients are absorbed — and everything about it is built to maximise that. Label the coils, circular folds, lumen and wall, and learn why the small intestine is so long, so coiled and so folded — in an interactive playground.

The duodenum is the C-shaped first part of the small intestine, where stomach acid is neutralised and bile and pancreatic juice go to work. Label the duodenum, its upper end, inner folds, wall and lower end, and learn why this short stretch is digestion's busiest crossroads — in an interactive playground.

The small intestine's lining is carpeted with tiny fingers called villi, where nutrients finally cross into the body. Label the microvilli, absorptive cells, lacteal, blood capillaries and goblet cell, and see how a digested meal is absorbed — in an interactive playground.

The intestine mixes food with a movement called segmentation — pinching it into pockets and churning it in place. Label the intestine wall, a constriction, a relaxed section and the chyme, and see how the gut mixes a meal rather than just pushing it along — in an interactive playground.

The large intestine, or colon, is the final stretch of the gut — it absorbs water and forms waste. Label the cecum, appendix, ascending, transverse, descending and sigmoid colon, and follow the leftovers around its path — in an interactive playground.

The rectum stores waste, and two sphincter muscles decide when it leaves. Label the rectum, rectal wall, anal columns, anal canal and sphincter muscle, and learn how your body holds and releases waste — in an interactive playground.

Before you look inside the eye, learn the parts you can already see in a mirror. Label the pupil, iris, sclera, eyelid, eyelashes and the tear-duct corner, and learn what each visible part does to let in light and protect the eye — in an interactive playground.

Your eye works like a living camera. Cut it open and label the cornea, lens, iris, retina, optic nerve and sclera, and follow light as it is focused onto a screen at the back of the eye and sent to the brain — in an interactive playground.

Every glance is a set of muscles at work. Look inside the eye socket and label the eyeball, the muscles that roll it up and down, the point where they anchor, and the bony socket that holds them — and learn how these little straps aim your gaze, in an interactive playground.

The retina is the screen at the back of your eye — but it is not the same all over. Label the retina, optic disc, macula, fovea and blood vessels on the real view a doctor sees, and learn where your sight is sharpest, where your blind spot is, and how the retina is fed — in an interactive playground.

Being 'in focus' means the light from what you look at is bent to meet at one sharp point on the retina. Label the cornea, lens, light rays, focus point and retina, and see how the eye focuses light like a camera — in an interactive playground.

Seeing happens in the brain, not the eye. Label the eye, optic nerve, optic chiasm, optic radiation and visual cortex, and follow the signals from both eyes — through the crossover where they swap sides — all the way to the back of the brain, in an interactive playground.

Your eyes make and drain tears all day to stay clean and wet. Label the tear gland, the eye, the tear ducts, the tear sac and the duct to the nose, and follow a tear from where it is made to where it drains — in an interactive playground.

Your digestive system is a long tube, plus helper organs, that turns food into fuel your body can absorb. Label the mouth, esophagus, stomach, liver, small intestine and large intestine, and follow food's journey from the first bite to the end — in an interactive playground.