This diagram covers Structure of the Human Digestive System within The Human Digestive System for GCSE Biology. Structure and function of digestive organs, mechanical and chemical digestion, enzymes, absorption, and practical investigations It is section 2 of 15 in this topic. Focus on the labels, the relationships between parts, and the explanation that turns the diagram into an exam-ready answer.
Practice questions for The Human Digestive System
Which organ produces hydrochloric acid to kill bacteria in food?
Explain the role of bile in the digestive system.
Quick recall flashcards
What is peristalsis?
Peristalsis is the wave-like contractions of smooth muscle that push food through the digestive system. Circular muscles contract behind food while longitudinal muscles relax in front.
What are villi?
Villi are tiny finger-like projections on the wall of the small intestine that greatly increase the surface area for absorption of nutrients.