IGCSE Biology - Excretion in humans (13.1)
igbiocomplete・2 minutes read
The lungs, kidneys, and liver play crucial roles in excreting waste products and excess substances from the body, with each organ performing specific functions such as excreting carbon dioxide, urea, and assimilating amino acids. The structure of a kidney, including nephrons and glomerulus, facilitates the filtration and reabsorption of substances to form urine, while the liver synthesizes proteins, converts amino acids, and aids in the excretion of urea to maintain bodily balance.
Insights
- The lungs excrete carbon dioxide, the kidneys excrete urea and excess substances, while the liver processes amino acids and eliminates waste through urea, collectively ensuring the removal of harmful substances from the body.
- The kidney's complex structure, including nephrons with glomerulus and renal tubules, allows for filtration of blood to remove waste products while reabsorbing essential components, demonstrating a vital role in maintaining the body's internal balance through urine formation.
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Recent questions
What are the main organs involved in excretion?
Lungs, kidneys, liver
What are the components of a kidney?
Cortex, medulla, nephrons
How does the liver assist in excretion?
Synthesizing proteins, deaminating amino acids
What is the function of the glomerulus in the kidney?
Filtration of substances from blood
Why is urea excreted by the kidneys?
Prevent accumulation and potential harm
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