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the U-shaped part of the nephron tubule situated between the proximal and distal convoluted tubules.
an artificial device that helps to stimulate and regulate the heart muscle.
the cylinder of parenchyma found from the centre of the stem to the inside of the vascular...
small ball of chewed food mixed with saliva that is formed in the mouth, which is swallowed.
an enzyme that catalyses (speeds up) the hydrolysis (breaking) of a chemical bond.