Describe how urea is formed and the path it follows from the point of formation until it is eliminated from the body.

-Urea is formed in the liver; amino group is removed from excess amino acids; the amino group combines with hydrogen; enters into ornithine cycle and combines with carbon (IV) oxide to form urea; urea moves through hepatic portal vein; to the vena cava; to the right atrium/ auricle; through tricuspid valve; into the right ventricle; through semi-lunar valve; and pulmonary artery; into the lungs; through pulmonary vein; into the left atrium; through bicuspid valve; into left ventricle; through semi-lunar valve and aorta; to the renal artery; efferent arteriole; glomerulus; Bowman’s capsule; proximal convoluted tubule; Loop of Henle; distal convoluted tubule; pelvis; ureter; urinary bladder; and passed out through urethra;