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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.
the tube through which urine passes from the bladder to the exterior.
a duct through which saliva passes from the salivary gland into the mouth.
region of the kidney into which urine is discharged from the collecting ducts of the nephrons,...
neurons that have more than two outgrowths from the cell body.