The diagram shows a section through a single liver lobule, illustrating the blood and bile pathways.
Which statement about liver structure and function is correct?
Blood entering via vessel PPP has a lower concentration of glucose and amino acids after a meal than blood leaving through vessel SSS.
The breakdown of excess amino acids by hepatocytes produces urea, which is secreted into channel TTT for removal via the digestive system.
Bile salts and metabolic waste products secreted into channel TTT flow towards the portal triad, in the opposite direction to blood flow in RRR.
Vessel QQQ brings deoxygenated blood under high pressure from the hepatic portal system to mix with blood from vessel PPP in sinusoid RRR.