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region of the kidney into which urine is discharged from the collecting ducts of the nephrons, before being passed into the ureter.
a molecule found inside red blood cells that can carry both oxygen and carbon dioxide.
the parts and processes of the body that recognise and fight pathogens, such as viruses and...
thin-walled or slightly strengthened, elongated phloem cells that conduct food substances.
the separation of large fat molecules into smaller drops for easy digestion.