Which statement about Morrison's pouch is true?

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The main idea here is the hepatorenal recess, Morrison's pouch, and how fluid behaves in the abdomen when a patient is lying on their back. In a supine patient, Morrison's pouch is the most gravity-dependent space in the peritoneal cavity. That means free intraperitoneal fluid tends to collect there first, making it the primary site surgeons and sonographers check for fluid on ultrasound or in trauma FAST exams. On an ultrasound, you’d look for an anechoic fluid layer between the liver and the right kidney in this space, which signals the presence of fluid even in small amounts.

The other statements aren’t correct because they describe functions of organs or spaces that Morrison's pouch is not. It isn’t the largest organ—the liver holds that distinction. It doesn’t drain bile; bile flows through the biliary ducts to the intestine, not via this peritoneal recess. It doesn’t store glycogen—the liver stores glycogen inside its cells, not in the peritoneal space.