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a ring of muscle that controls the passage of substances through a tube or body opening.
organelles in which cellular respiration takes place to produce ATP to supply cells with energy...
tough connective tissue found in conjunction with muscle, cartilage and bone.
a ductless gland that secretes hormones directly into the bloodstream, to be transported to...
disease caused when the arteries that supply the heart muscle become narrowed or blocked by the...
the main force responsible for the upwards movement of water in the xylem.