knowverseFat-soluble vs water-soluble vitamins differ in how the body absorbs and stores them, with vitamins A, D, E, and K needing dietary fat for absorption while B vitamins and vitamin C dissolve in water. The quiz covers vitamin roles in vision, calcium absorption, antioxidant function, blood clotting, metabolism, DNA synthesis, nerve health, and collagen production, plus bioavailability factors like food preparation and digestive health. Try the questions to check your understanding.
Your score is next.
Bioavailability concerns what the body can absorb and use.
The actual amount of a nutrient that is absorbed and becomes available for use is called its bioavailability.
From the Knowverse course text.
A, D, E and K are the fat-soluble group.
Vitamins A, D, E, and K belong to a group called fat-soluble vitamins, meaning they behave exactly like oils.
From the Knowverse course text.
Vitamin A is required for normal visual function.
The central player in this rebuilding process is Vitamin A, a fat-soluble nutrient that your body must constantly supply to the retina.
From the Knowverse course text.
Beta-carotene is a provitamin A carotenoid.
Actually, no. Carrots contain *beta-carotene*, which the body only converts into Vitamin A as needed. Toxicity usually only happens with *pre-formed* Vitamin A found in animal livers or synthetic supplements.
From the Knowverse course text.
Vitamin D supports calcium absorption.
Once activated, the primary job of Vitamin D is to facilitate calcium absorption in the small intestine.
From the Knowverse course text.
Vitamin K is needed for several clotting proteins.
No. Vitamin K simply provides the *capacity* for the blood to clot when there is an injury. It doesn't trigger the clots itself. The body has other complex systems to ensure clots only form when and where they are needed.
From the Knowverse course text.
B vitamins help enzymes work rather than being calorie sources.
Thiamin, Riboflavin, and Niacin are not energy sources themselves. Instead, they are the essential coenzymes that allow our bodies to harvest energy from food.
From the Knowverse course text.
Folate is vitamin B9 and participates in DNA synthesis.
The first member of this construction crew is Folate, also known as Vitamin B9, which is primarily responsible for building the components of DNA.
From the Knowverse course text.
Intrinsic factor is a protein involved in normal B12 absorption.
This escort is a protein called Intrinsic Factor, which is produced by the cells in your stomach lining.
From the Knowverse course text.
Vitamin C participates in collagen synthesis and also aids nonheme iron absorption.
Vitamin C acts as a necessary helper in this building process by activating the enzymes that strengthen the collagen strands.
From the Knowverse course text.
See the answer and explanation for each question below.
Find more quizzes and full courses in the free iOS app.
Read more about the topic
Vitamins support body processes in small amounts. The amount in a food and the amount the body can use are different measures. Bioavailability describes the portion absorbed and available for use. Food preparation, the other foods in a meal and digestive health can all influence that amount.
Vitamins A, D, E and K are fat-soluble, and fat absorption helps the body absorb them. They can be stored in the liver and fatty tissues. The B vitamins and vitamin C are water-soluble. Storage and excretion differ by vitamin, so that classification alone does not tell you everything about its behavior.
The actual amount of a nutrient that is absorbed and becomes available for use is called its bioavailability.
From the Knowverse course text.
Vitamin A supports vision, including the light-sensitive system used in dim light. Beta-carotene can serve as a precursor that the body converts into vitamin A. Vitamin D helps calcium absorption. Vitamin E has antioxidant roles, while vitamin K is needed for proteins involved in normal blood clotting.
B vitamins participate in metabolism rather than supplying calories themselves. Folate supports DNA synthesis, and vitamin B12 supports nerve function as well as blood-cell formation. Intrinsic factor helps the normal absorption of B12. Vitamin C supports collagen synthesis and improves absorption of nonheme iron, the form found in plant foods.
Vitamin C acts as a necessary helper in this building process by activating the enzymes that strengthen the collagen strands.
From the Knowverse course text.
Sources: Water and Fat-Soluble Vitamins. Each question or step includes an excerpt from the course.
