Edexcel IGCSE Biology 复习笔记 2.9.4 Kidney Structure & Function
Waste substances removed by the kidney
The structure and location of the kidney
Structure of a nephron
Diagram showing the process of ultrafiltration
Components of Filtrate Table
Diagram showing reabsorption in the nephron
Take care to describe clearly where substances are moving from and to in the kidneys (ie. glucose moves from the filtrate into the bloodstream when it is selectively reabsorbed. Using your technical terminology incorrectly here could lose you marks.Also – small substances such as urea are forced out of the blood during filtration as a result of high-pressure mass flow, they don’t diffuse out of the blood.