(i) Glomerulus and tubular reabsorption.–––––––––––––––––––––––
∙ The blood flows through the glomerulus under great pressure which is much greater than in the capillaries elsewhere.
∙ This high pressure causes the liquid part of the blood to filter out from the glomerulus into the renal tubule.
∙ This filtration under great pressure is called ultrafiltration.