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an artificial device that helps to stimulate and regulate the heart muscle.
the cone-shaped region of the renal medulla, made up of the loops of Henlé and the collecting...
the parts and processes of the body that recognise and fight pathogens, such as viruses and...
birds without a keel on their breastbones and therefore unable to fly, for example ostriches....
cells that are formed during secondary growth by the vascular cambium ring just to the outside...