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 129 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?

People about to have surgery must tell their health care providers about all supplements they take.

Did you know?

Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.

Did you know?

According to the American College of Allergy, Asthma & Immunology, more than 50 million Americans have some kind of food allergy. Food allergies affect between 4 and 6% of children, and 4% of adults, according to the CDC. The most common food allergies include shellfish, peanuts, walnuts, fish, eggs, milk, and soy.

Did you know?

Approximately 500,000 babies are born each year in the United States to teenage mothers.

Did you know?

Asthma-like symptoms were first recorded about 3,500 years ago in Egypt. The first manuscript specifically written about asthma was in the year 1190, describing a condition characterized by sudden breathlessness. The treatments listed in this manuscript include chicken soup, herbs, and sexual abstinence.

Banded iron formations Banded iron formations
Iron Deficiency Symptoms Iron Deficiency Symptoms
True-color view of Mars seen through NASA's Hubble Space Telescope in 1999 True-color view of Mars seen through NASA's Hubble Space Telescope in 1999
Absorption spectra of cytochromes Absorption spectra of cytochromes
Facilitated Diffusion: Absorption Methods in the Small Intestine Facilitated Diffusion: Absorption Methods in the Small Intestine
Anterosuperior view of true pelvis (blue) Anterosuperior view of true pelvis (blue)
Video: Glucose Evaluation Procedure

For a complete list of videos, visit our video library