Which of the following statements is true regarding the structure and function o
ID: 208256 • Letter: W
Question
Which of the following statements is true regarding the structure and function of a liver lobule? Which of the following statements is true regarding the structure and function of a liver lobule?
1.The liver is unusual in that it receives both arterial and venous blood, with one-third of the blood it receives being venous blood.
2.At each corner of the liver lobule is a portal triad consisting of the interlobular bile duct, interlobular artery, and hepatic portal vein.
3.The pathway of bile as it is secreted from the hepatocytes is to go to the bile canaliculi, bile ductules, and finally interlobular bile ducts.
4.The function of hepatocytes is to control levels of circulating nutrients, secrete bile, and store ingested iron and heavy metals.
5.The pathway of blood as it enters the liver is through the inferior vena cava, interlobular arteries and veins, the central vein, and finally the hepatic vein.
Explanation / Answer
ANSWER is: 2,3,4,5 all are correct, except 1
EXPLANATION:
1) As in 1st option, The liver is unusual in that it receives both arterial and venous blood is correct but one-third of the blood it receives being venous blood is wrong...
The liver is unusual as it receives a blood supply from two sources.
- The first source is hepatic artery which delivers oxygenated blood from the general circulation.
- The second source is the hepatic portal vein that deliver deoxygenated blood from the small intestine containing nutrients.
one-third of the blood it receives being hepatic artery and portal vein supplies about two thirds of the blood
2) Along the periphery of each lobule, portal triads are present that consist of one branch each of hepatic artery, portal vein and an interlobular bile duct.
3) Hepatocytes secrete bile then to bile canaliculus. It is a thin tube that collects bile that is secreted by hepatocytes. The bile canaliculi will merge and form bile ductules that become common hepatic duct. Bile canaliculi formed by grooves on lateral faces of hepatocytes.
4) The function of hepatocytes is to control levels of circulating nutrients through selective absorption and secretion. It also secrete bile. store ingested iron and heavy metals.Kupffer cells store iron, some lipids and heavy metals such as tin or Hg that are absorbed by liver cells.
5) Hepatic vein drains venous blood from the liver into the inferior vena cava. Blood enters the hepatic vein through central veins. The liver receives blood supply from the hepatic artery and the portal vein and these vessels propagate in the liver as interlobar and then as interlobular arteries....
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