What anatomical feature of the veins maintains a unidirectional flow of blood back toward the heart?

This patient undergoes a gallbladder sonogram due to epigastric pain. the report indicates that the visualized portions of the liver are normal. no free fluid noted within morisons pouch. the gallbladder is identified and is empty no evidence of wall thickening or surrounding fluid is seen there is no ductal dilation. the common hepatic duct and common bile duct measure 0.4 and 0.8 cm respectively. the common bile ductmeasurement is at the upper limits of normal what cpt code in icd-10 cm code was used

Read each description below and determine to which stage of sleep each pertains. then click and drag each box into the appropriate category below.

Due tonight 10 points will mark brain