What is the difference between excretion and egestion? Name three major organs of excretion in humans, the substances they excrete and the function of this excretion.

Excretion is the removal of toxic materials, waste products of metabolism and excess substances from organisms.

Egestion is the passing out of undigested food as faeces, through the anus.

Three major organs of excretion are the skin, kidneys and lungs.

Sweat glands in the skin produce sweat. This contains water, urea and salt. Excreting sweat helps keep the body cool in hot conditions.

The kidneys remove excess water, salts and urea to prevent a toxic build-up of these substances in the body.

The lungs remove excess carbon dioxide (and some water) when breathing out.

Answered by Lucy W. Biology tutor

99872 Views

See similar Biology GCSE tutors

Related Biology GCSE answers

All answers ▸

How does transcription work?


Describe two ways the body prevents the entry of microorganisms.


Male B has a mass of 72kg, and a height of 1.81m. Calculate the BMI of Male B to 3.s.f. (3)


Explain the process of osmosis giving an example of why it is important for cell function.


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 2013–2024

Terms & Conditions|Privacy Policy