Human Nutrition Part 1: Digestion

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Follow a meal through the digestive system and learn how large food molecules are broken down into small ones your body can absorb, with clear animations at every step. You will learn: • Why large, insoluble molecules must be digested • The 5 stages: ingestion, digestion, absorption, assimilation, egestion • The organs of the alimentary canal and the helper organs • The mouth: chewing, saliva and amylase • Swallowing and peristalsis • The stomach: churning, pepsin and hydrochloric acid • The duodenum: pancreatic juice, bile and emulsification • Enzymes and their products • Physical vs chemical digestion (the bile mistake!) • Exam-style questions with answers This is part 1 of 2 in Human nutrition Part 1 – Digestion (this lesson) Part 2 – Absorption and assimilation © 2026 teachly.lk. All rights reserved. This lesson and its animations are original teachly.lk content. Please do not copy, download, re-upload or share it outside teachly.lk without permission. teachly.lk is an independent learning resource and is not affiliated with Cambridge Assessment International Education.

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