This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: Which of the following is true regarding iron absorption? a. Vegetable nonheme iron is more ... (Read 186 times)

mmm

  • Hero Member
  • *****
  • Posts: 558
on: Jun 25, 2018
Which of the following is true regarding iron absorption?
 
  a. Vegetable nonheme iron is more easily absorbed than heme iron.
  b. Most of the iron consumed is absorbed.
  c. Ascorbic acid (vitamin C) enhances absorption.
  d. Those who are iron deficient absorb less iron.

Question 2

What is the mechanism for iron toxicity if iron is present in excess amounts?
 
  a. Acts as a catalyst in forming free oxygen radicals
  b. Impedes hematopoiesis
  c. Reduces hemoglobin to methemoglobin
  d. Interferes with globin synthesis


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

bobsmith

  • Sr. Member
  • ****
  • Posts: 316
Reply #1 on: Jun 25, 2018
Answer to Question 1

ANS: C
Ascorbic acid (vitamin C) does enhance absorption of iron. Vegetable nonheme iron is less readily absorbed than heme iron, even though it makes up more of our dietary iron source. Only approximately 10 of dietary iron is absorbed per day. People who are iron deficient absorb a larger percent of iron than do normal persons.

Answer to Question 2

ANS: A
Iron has reduction (redox) potential, and easily cycles between ferrous (reduced) and ferric (oxidized) forms. If it is found in excess, then it plays a key role in forming harmful oxygen radicals that can damage cellular structures, thus harming cells in the process.


mmm

  • Hero Member
  • *****
  • Posts: 558
Reply #2 on: Jun 25, 2018
Correct answers!


bobsmith

  • Sr. Member
  • ****
  • Posts: 316
Reply #3 on: Jun 25, 2018
Great! Please up vote :D


« previous next »
 

Did you know?

Pink eye is a term that refers to conjunctivitis, which is inflammation of the thin, clear membrane (conjunctiva) over the white part of the eye (sclera). It may be triggered by a virus, bacteria, or foreign body in the eye. Antibiotic eye drops alleviate bacterial conjunctivitis, and antihistamine allergy pills or eye drops help control allergic conjunctivitis symptoms.

Did you know?

Vampire bats have a natural anticoagulant in their saliva that permits continuous bleeding after they painlessly open a wound with their incisors. This capillary blood does not cause any significant blood loss to their victims.

Did you know?

According to animal studies, the typical American diet is damaging to the liver and may result in allergies, low energy, digestive problems, and a lack of ability to detoxify harmful substances.

Did you know?

Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.

Did you know?

In most climates, 8 to 10 glasses of water per day is recommended for adults. The best indicator for adequate fluid intake is frequent, clear urination.

The iron atom of heme has six coordination bonds: four in the plane The iron atom of heme has six coordination bonds: four in the plane
Which of the following statements is true of linkage? Which of the following statements is true of linkage?
Iron metabolism. Iron metabolism.
Absorption spectra of cytochromes Absorption spectra of cytochromes
Endocytosis: Absorption Methods in the Small Intestine Endocytosis: Absorption Methods in the Small Intestine
Hemoglobin Contains Heme Iron Hemoglobin Contains Heme Iron
Video: Nerve Impulse Transmission Animation

For a complete list of videos, visit our video library