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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.
an autoimmune disease which is treated with insulin injections.
blood that has no antigens (blood group O) and can be given to a person with any blood group....
a complex chemical compound that fills the spaces in the cell wall between cellulose, ...
a gland which secretes substances, usually enzymes, through a duct directly to the part of the...