Vitamin D and E Quiz

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Questions and Answers

Which of the following statements about fat-soluble vitamins is true?

Fat-soluble vitamins are not affected by high intakes.

Fat-soluble vitamins cannot be stored in body fat.

Fat-soluble vitamins require bile and dietary fat for absorption. (correct)

Fat-soluble vitamins are easily excreted in urine.

What is the role of vitamin D according to the text?

Vitamin D has no specific role mentioned in the text.

Vitamin D is only important for bone health.

Vitamin D is important for bone health, normal functioning of the parathyroid gland, and regulation of the immune system. (correct)

Vitamin D is important for electrolyte balance.

What is the transportation method for fat-soluble vitamins after absorption?

Transported directly into the bloodstream without any carrier.

Transported with fats through the lymphatic system in chylomicrons before entering the blood. (correct)

Transported in the urine.

Transported through the liver without any specific carriers.

How are water-soluble vitamins eliminated from the body?

In urine Signup and view all the answers

What increases the risk of toxicity with high intakes of fat-soluble vitamins?

The ability to be stored in body fat Signup and view all the answers

What is the main function of vitamin E?

Antioxidant protection Signup and view all the answers

Which statement is true about water-soluble vitamins?

They cannot be stored in body fat and are eliminated in urine. Signup and view all the answers

What is the risk of deficiency with fat-soluble vitamins, as mentioned in the text?

Intakes can vary without a risk of deficiency as long as there are average intakes over time. Signup and view all the answers

What is the role of vitamin K?

Blood clotting and bone health Signup and view all the answers

Why are fat-soluble vitamins not easily excreted, as mentioned in the text?

Because they can be stored in body fat Signup and view all the answers

What is the role of Vitamin C in bone health?

Assists in the formation of healthy collagen, essential for bone health Signup and view all the answers

What happens when concentrations of solutes in the blood increase?

The brain releases antidiuretic hormone (ADH) to signal the kidneys to reabsorb water Signup and view all the answers

What is the principal positively charged ion inside cells?

Potassium (K+) Signup and view all the answers

What is the recommended intake for adults for drinking water?

2.7-3.7 L/day Signup and view all the answers

What happens in water intoxication (overhydration)?

Too much water relative to the amount of sodium in the body results in a drop of sodium levels Signup and view all the answers

What are the early symptoms of mild dehydration?

Headache, fatigue, loss of appetite, dry eyes and mouth, dark-colored urine Signup and view all the answers

What is the role of antidiuretic hormone (ADH) in response to increased plasma osmolarity?

ADH release increases and water is reabsorbed Signup and view all the answers

What happens when solute concentration is low?

ADH level decreases, and more water is excreted into the urine Signup and view all the answers

What is the consequence of a deficiency of water in the body?

Reduces the blood volume, affecting the delivery of oxygen and nutrients to cells Signup and view all the answers

Which vitamin is primarily responsible for regulating calcium levels in the blood?

Vitamin D Signup and view all the answers

What is the primary function of Vitamin E?

Acting as an antioxidant Signup and view all the answers

How is Vitamin D synthesized in the skin?

Ultraviolet light converts 7-dehydrocholesterol to vitamin D3 Signup and view all the answers

Which vitamin is easily lost through urination and requires frequent replenishment?

Vitamin C Signup and view all the answers

What is the active form of Vitamin D that regulates calcium levels in the blood?

1,25-dihydroxy vitamin D Signup and view all the answers

Which vitamin is found in cell membranes and can have its antioxidant function restored by Vitamin C?

Vitamin E Signup and view all the answers

What is the main role of Vitamin C in the body?

Acting as an antioxidant Signup and view all the answers

Which vitamin is needed for collagen crosslinking and antioxidant functions?

Vitamin C Signup and view all the answers

How is Vitamin E transported to the liver?

By chylomicrons Signup and view all the answers

What converts 7-dehydrocholesterol to vitamin D3 in the skin?

Ultraviolet light Signup and view all the answers

Study Notes

Vitamin D and Vitamin E Functions and Deficiencies

Vitamin D is consumed in foods, obtained from fortified foods, synthesized in the skin, and travels in the blood to the liver.
Ultraviolet light converts 7-dehydrocholesterol to vitamin D3 in the skin.
Enzymes in the liver and kidneys convert vitamin D to its active form, 1,25-dihydroxy vitamin D, which regulates calcium levels in the blood.
Vitamin D maintains calcium and phosphorus levels for various bodily functions, including bone mineralization and hormone release.
Vitamin D deficiency leads to inefficient calcium absorption and bone abnormalities.
Vitamin E primarily functions as an antioxidant, with alpha-tocopherol being the only form utilized by humans.
Vitamin E is transported to the liver by chylomicrons and is needed for neutralizing free radicals.
Water-soluble vitamins B and C are easily lost through urination and require frequent replenishment.
Vitamin C acts as an antioxidant, aids in collagen production, and is important for the immune system and iron absorption.
Collagen crosslinking and antioxidant functions are dependent on the presence of vitamin C.
Reactive oxygen molecules, generated from environmental sources and cellular respiration, can be neutralized by vitamin C.
Vitamin E, being lipophilic, is found in cell membranes and its antioxidant function can be restored by vitamin C, which donates an electron back to it.

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Description

Test your knowledge of vitamin D and vitamin E functions and deficiencies with this quiz. Learn about their sources, conversion processes, roles in the body, and the impact of deficiencies.