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Vitamins Overview

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Questions and Answers

What do the letters 'vitamin' stand for?

Vital amines (correct)

Vital acids

Vital amino acids

Vital alkaloids

How are fat-soluble vitamins typically transported and excreted in the body?

They are actively transported and stored in the body

They are closely associated with and transported by dietary lipids, and are generally excreted with feces (correct)

They are passively absorbed and excreted through urine

They are actively transported and excreted through sweat

What is the main function of vitamins in the human body?

To provide energy

To regulate metabolism and physical function (correct)

To act as antioxidants

To build muscle

What is the main source of the preformed vitamin A, retinol?

Animal sources Signup and view all the answers

What is the main source of the provitamin A, beta-carotene?

Plant foods Signup and view all the answers

Where are vitamin A compounds primarily deposited in the body?

In the liver, kidneys, lungs, and adipose tissues Signup and view all the answers

What is the primary source of vitamin A in human nutrition?

Beta-carotene Signup and view all the answers

What factor can negatively affect the absorption of vitamin A?

Low-fat diet Signup and view all the answers

How can vitamin D be synthesized in the body?

Through exposure to ultraviolet light and cholesterol in the skin Signup and view all the answers

Which two forms of vitamin D are nutritionally significant?

Vitamin D2 (calciferol) and vitamin D3 (cholecalciferol) Signup and view all the answers

What is the role of vitamin E in the absorption of vitamin A?

Vitamin E prevents the excessive oxidation of vitamin A Signup and view all the answers

What effect does protein-energy malnutrition have on the absorption of vitamin A?

It reduces the absorption of vitamin A due to lack of carrier protein Signup and view all the answers