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Homeostasis, Excretion and Coordination
Quick questions on Excretion and the kidney explained: O-Level Biology
5short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is 1. Filtration?Show answer
Blood enters the kidney at high pressure. Small molecules are forced out of the blood into the kidney tubule: water, glucose, salts and urea. Large molecules such as proteins and the blood cells are too big and stay in the blood.
What is 2. Selective reabsorption?Show answer
As the filtrate passes along the tubule, useful substances are reabsorbed back into the blood: all the glucose (by active transport), most of the water (the amount controlled to balance the body), and some salts. What is left, mainly water, urea and excess salts, continues on as urine.
What is q1?Show answer
Define excretion. [2 marks]
What is q2?Show answer
Name the waste product removed by the kidney and state where it is made. [2 marks]
What is q3?Show answer
Explain why a healthy person has no glucose in their urine. [2 marks]
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