Zen had an interesting lesson in his study materials: Excretion and Defecation!
Teacher – Class, our topic of dicussion today is the process of excretion and defecation. Do you know the meaning of excretion?
Candy – Urinating!
Benny – Sweating!
Student 3 – Defecating!
Student 4 – Breaking wind!
Teacher – Benny and Candy are smart! Urinating and sweating are the process of excretion.
Student 3 – Teacher, why isn’t defecating considered a process of excretion?
Teacher – Defecating is not a process of excretion but a process of discharging faeces from the body.
E&D3
Candy – Teacher, Benny is always complaining of stomach aches and wants to defecate.
Benny (alarmed) – When was that?
Teacher – So, do you know the difference between excretion and defecation? Excretion is the expulsion of unwanted substances by the body as it carries out the process of metabolism such as crying or weeping, sweating, urinating, breathing.
E&D4
Teacher – Defecation occurs when the body expels faeces which are the solid waste substances of food that the body no longer can absorb.
Benny (making a beeline for the boys’ room) – I’ve a stomach ache.
Teacher – Do you understand?
All – WE DO, TEACHER!
Notable facts:
Excretion is the removal of waste products, such as urine, sweat and carbon dioxide from the body. Excretion takes place through the skin, lungs and special organs called kidneys.
When we defecate, our bodies get rid of undigested food or waste materials called faeces.
Why do we need to defecate? Why must we get rid of these waste materials?
We get rid of those wast materials such as sweat, urine, carbon dioxide and faeces from our body so that the wast materials would not be harmful to our health.
Vocabulary – metabolism: chemical process in humans that changes food into energy and material for growth.