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a small body of modified cardiac muscle cells in the upper right corner of the wall of the right atrium that acts as a pacemaker, initiating and maintaining the heartbeat.
a disease caused when the body's immune system destroys other body cells.
a drug that inhibits (slows down) the action of the nervous system.
simple connective tissue with a network of white, inelastic, collagen fibres and small, yellow,...
a clear, colourless, odourless and tasteless liquid that can also occur as a gas (water vapour)...