Iron Absorption, Transport, Metabolism and Regulation - Biochemistry Lesson

The video explains iron absorption, transport, and metabolism in the body. It covers how iron is absorbed in the intestines, stored, and transported in the bloodstream. The role of proteins like duodenal cytochrome B, ferritin, and transferrin is discussed, along with the regulation of iron levels by hepcidin. The video also outlines dietary sources of iron, recommended daily allowances for different age groups, and the increased needs during pregnancy.

What happens to Fe3+ when it comes into contact with duodenal cytochrome B?

• It is converted to a gaseous form.

• It remains unchanged.

• It is reduced to Fe2+.

• It is oxidized to Fe4+.

Which protein is responsible for transporting Fe2+ into the bloodstream from enterocytes?

• Ferritin

• Transferrin

• Hemosiderin

• Ferroportin

What role does transferrin play in iron metabolism?

• It converts Fe3+ to Fe2+.

• It transports iron through the blood.

• It stores iron in the liver.

• It inhibits iron absorption in the intestines.

How does hepcidin regulate iron levels in the body?

• By converting Fe2+ to Fe3+ in the blood.

• By inhibiting ferroportin and reducing iron uptake into the bloodstream.

• By promoting the release of iron from the liver.

• By increasing iron absorption in the intestines.

What happens to iron in enterocytes if ferroportin is inhibited?

• It is stored indefinitely in the enterocytes.

• It is converted back to Fe3+.

• It is transported to the liver for storage.

• It is excreted in feces as enterocytes are replaced.

Which form of dietary iron is found in plant materials?

• Ferric iron

• Ferrous iron

• Non-heme iron

• Heme iron

How much iron is recommended daily for pregnant women?

• 27 milligrams

• 18 milligrams

• 11 milligrams

• 8 milligrams