Biology · Class 7–10

The Digestive System

Trace food on its journey from mouth to absorption, and see where digestion happens at each stop.

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🧠 Remember it

The Digestive System

Food's path: Mouth → Oesophagus → Stomach → Small intestine → Large intestine. Remember the small intestine is where most absorption happens — "small in size, big in job."

🌏 In real life

Chew a roti slowly and it starts tasting sweet — that is the saliva enzyme (amylase) breaking starch into sugar right in your mouth, the very first step of digestion.

📝 Quick notes

  • Digestion begins in the mouth: teeth grind food while saliva's amylase breaks starch into sugar.
  • The oesophagus pushes food to the stomach by peristalsis (wave-like muscle movements).
  • Stomach: gastric juice has HCl (kills germs, activates enzymes) and pepsin (digests protein).
  • Small intestine: the main site of BOTH digestion and absorption; bile (from liver) and pancreatic juice act here.

🎯 Test yourself

Where is most of the food absorbed into the blood?

In the small intestine, through the villi.

Learn it fully — free

See the animated, step-by-step The Digestive System lesson on Syllab

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