How is the small intestine adapted for efficient absorption?

Diffusion is the main mechanism for absorption within the small intestine, so effective diffusion is the key to sufficient nutrient absorption. The small intestine has a very large surface area, created by folds and the presence of villi and microvilli. These are finger-like projections from the inner cells of the intestine which are only one-cell thick, allowing for a short diffusion distance between the intestinal lumen and surrounding capillaries. The vast network of capillaries surrounding the small intestine (located within the villi) ensures a constant concentration gradient is maintained, which also increases the rate of diffusion.

ML
Answered by Michelle L. Biology tutor

6788 Views

See similar Biology GCSE tutors

Related Biology GCSE answers

All answers ▸

Describe how different environmental factors affect the direction of growth of roots and shoots making reference to plant hormones


what is mitosis


What are the four levels of protein structure?


Can you explain the difference between diffusion and osmosis?


We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences