Excretory Processes,”1) Filtration. The excretory tubule collects a filtrate from the blood.Water and solutes are forced by blood pressure across the selectively permeable membranes of a cluster of capillaries and into the excretory tubule.2) Reabsorption. The transport epithelium reclaims valuable substances from the filtrate and returns them to the body fluids.3) Secretion. Other substances, such as toxins and excess ions

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