Chemical activities or metabolic activities occurs all the time in the body while carrying out life processes to sustain life. These activities produce harmful or toxic substances that are not needed by the body
metabolic waste products or excretory products need to be removed by the body
Metabolic Waste Products
• Carbon dioxide
• Urea
• Mineral salts or ions
• Water
Metabolic Waste Product: CO2
• waste product of aerobic respiration
• remove through gaseous exchange in the lungs
• Abnormallyhigh level of CO2 in the blood may lead to conditions such as headaches, confusion and rapid breathing
Metabolic Waste Product: Urea
Proteins in food are broken down into amino acids
amino acids are used by the body, and excess amino acids are converted into urea in the liver through deamination
Abnormally high level of urea in blood may cause conditions such nausea and vomiting
excreted as urine and in sweat (kidney and skin)
Eating food high in protein increase urea level in blood
Metabolic Waste Product: Mineral Salts or Ions
mineral salts and ions from food are used by the body
excess mineral salts and ions are excreted as constituents of urine and sweat
Metabolic Waste Product: H2O
Produced as waste product of aerobic respiration
water that we consume is used by the body
Excess water is excreted by the body as constituents of urine and sweat
Excretion
Excretion is the process of removing metabolic waste products, toxic substances and excess substances from the body
Excretion prevents harmful substances from building up in the body and causing cause harm
