Excretion in human beings and nephron
Excretion is the removal of metabolic wastes from the body, mainly through kidneys, lungs, skin, and liver.
Practice This ConceptMain explanation
Teacher explanation
The kidneys filter blood and remove urea, extra salts, and excess water as urine. Inside each kidney, nephrons perform filtration, reabsorption, and secretion. This keeps the blood composition balanced and prevents waste buildup.
Example
After drinking a lot of water, the body may produce more dilute urine to maintain balance.
Simple analogy
Kidney filters, nephron fine-tunes, urine carries waste.
Common confusion
Students think excretion is the same as egestion.
Exam tip
In answers, use the words filtration, reabsorption, and urine formation.
Answer writing and exam use
1-mark use
Write the exact meaning of excretion in human beings and nephron in one clean line.
2-mark use
Define excretion in human beings and nephron and add one example or condition.
3-mark use
Explain excretion in human beings and nephron, show the method or example, and mention the common mistake.
Practice this concept with focused MCQs
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