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EXCRETION IN HUMANS - BIOLOGY IGCSE
María Belén Cerliani
Created on March 2, 2023
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EXTENDED ONLY
EXTENDED ONLY
EXCRETION(MRS GREN)
CHAPTER 12
THE LIVER
THE KIDNEY
THE HUMAN EXCRETORY SYSTEM
organs
EXCRETORY PRODUCTS
EXCRETION IN HUMANS
DEFINITION
Excretion is the removal of the waste substances of metabolic reactions (the chemical reactions that take place inside cells), toxic materials and substances in excess of requirements.
Produced by the breakdown of heamoglobin in the LIVER. Excreted by the FEACES.
BILE PIGMENTS
EXCRETORY PRODUCTS OF MAMMALS
Produced by deamination of excess proteins in the LIVER. Excreted by the KIDNEYS in the urine.
UREA
Excreted by the KIDNEYS.
EXCESS WATER AND SALTS/ions
Produced by all cells during respiration, and excreted through the LUNGS.
CARBON DIOXIDE
organs
THE HUMAN EXCRETORY SYSTEM
THE KIDNEY
THE NEPHRON
- Role in the assimilation of amino acids by converting them to proteins.
- Deamination: the removal of the N-containing part of amino acids to form urea. Urea must be excreted because is toxic in high concentrations.
the liver