Excretion Flashcards
What is excretion?
Excretion is the elimination of metabolic waste from the body
What are ectotherms?
Ectotherms gain or lose heat from or to their external environment
What are endotherms?
Endotherms generate their own best from metabolic reactions
What is filtration?
Filtration means that water and small molecules pass (under high pressure) from the blood into the nephron
What is reabsorption?
Reabsorption means that molecules pass from the nephron back into the blood
What is active transport?
Active transport means that energy (in the form of ATP) is used to move molecules, often against a concentration gradient, i.e. from low concentrations to high concentrations
What is secretion?
Secretion means that some substances pass from the blood into the nephron
