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.

Answered by Michelle L. Biology tutor

6480 Views

See similar Biology GCSE tutors

Related Biology GCSE answers

All answers ▸

What are is the function of a ribosomes and what is it made from?


How are animals adapted for effective gas exchange?


Of what smaller molecules are carbohydrates made of and what is their main function in the body?


Describe why organisms may become extinct due to a change in the climate


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences