• The kidneys move down on inspiration.
• The nephron consists of a glomerulus and the tubules that leave it.
• Filtrate is formed in the glomerulus and altered in composition and volume by the tubules.
• An afferent arteriole supplies the glomerulus and an efferent arteriole drains the glomerulus.
• The filtration barrier consists of a layer of endothelial cells, a layer of epithelial cells and a basement membrane between them.

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C. A. O'Callaghan 2004