The transport of iron out of the intestinal cell for incorporation into serum transferrin is aided by the proteinMultiple Choiceinsulin.myoglobin.ferroportin.thyroxine.

Iron is an example of a nutrient that enters cells using simple diffusion. a membrane transport protein. a pump. endocytosis.

A carrier of soaked up iron is:Ответы(один ответ)1  A) Ferritin2  C) Transferrin3  E) Peroxidase4  D) Catalase5  B) Hemosiderin

__________ are complexes that remove iron from transferrin for their own use.ANSWERProteasesCoagulasesSiderophoresLipases

The main site of absorption of iron is the ________________.a.ileumb.colonc.jejunumd.duodenum

Two Kinds of IronThe human body needs iron to produce hemoglobin, a substance that helps red blood cells transport oxygen. Without enough iron, a person may feel tired and weak. Dietary sources of iron include plant sources, such as vegetables and beans, and animal foods, including poultry, red meat, and fish. However, plant and animal sources are not equal. The iron in plants, called nonheme iron, is not easily absorbed by the human digestive system. For example, a half cup of cooked spinach contains a healthy dose of over three milligrams of iron. Unfortunately, only five percent of that iron can be used by the body. On the other hand, the iron in animal foods, called heme iron, is better utilized. Heme iron is contained within a ring of protein, which helps the body to absorb it easily.What is the main, or central, idea of the passage?Plant and animal food sources both contain iron, which helps red blood cells carry oxygen throughout the body.Plant and animal food sources both contain iron, but the iron in animal foods is more accessible to the body.Heme iron, found in meat and fish, is easily absorbed by the human body.Submit