vit D

Question 1

What are the primary sources of vitamin D?

Answer 1

Egg yolk, sunlight, mushrooms, oily fish (sardines, trout, mackerel), fortified foods

Each source contributes differently to vitamin D levels in the body.

Question 2

What are the key functions of vitamin D?

Answer 2

Maintenance of calcium and phosphate levels, bone development, cell differentiation, immune function, brain function

These functions are crucial for overall health and well-being.

Question 3

What role does cholesterol play in vitamin D synthesis?

Answer 3

Cholesterol is needed to synthesize vitamin D from sun exposure

This highlights the connection between dietary fats and vitamin D production.

Question 4

What factors can reduce vitamin D absorption?

Answer 4

Obesity, dark skin, elderly age, low-fat diets

These factors can lead to a deficiency in vitamin D levels.

Question 5

What is the role of vitamin K2 in relation to vitamin D?

Answer 5

Helps calcium move into bones along with vitamin D

This synergy is important for bone health.

Question 6

What is vitamin D3 also known as?

Answer 6

Cholecalciferol

It can be obtained from endogenous sources, animal sources, food, and supplements.

Question 7

What is vitamin D2 also known as?

Answer 7

Ergocalciferol

It primarily comes from plant sources.

Question 8

What is the active form of vitamin D?

Answer 8

Calcitriol

Calcitriol is crucial for the biological effects of vitamin D.

Question 9

What are the consequences of vitamin D deficiency in children?

Answer 9

Rickets

Rickets is characterized by weak or soft bones in children.

Question 10

What are some symptoms of vitamin D deficiency in adults?

Answer 10

Fatigue, impaired immunity and frequent infection osteoporosis, muscle and bone pain .

These symptoms can significantly affect quality of life.

Question 11

How does vitamin D affect calcium and phosphorus levels in the blood?

Answer 11

Increases calcium and phosphorus levels, decreases calcium excretion from kidneys

This regulation is vital for maintaining bone health.

Question 12

What happens to osteoclast activity when serum calcium rises?

Answer 12

The thyroid releases calcitonin to stop osteoclast activity

This mechanism helps regulate calcium levels in the body.

Question 13

Fill in the blank: Vitamin D increases calcium absorption from _______.

Answer 13

Enterocytes

Enterocytes are intestinal cells involved in nutrient absorption.

Question 14

What is the effect of vitamin D on calcium release from bones?

Answer 14

Increases release of calcium from bones (increases osteoclast activity)

Osteoclasts are cells that break down bone tissue to release calcium.

Question 15

what are signs of toxicity

Answer 15

hypercalcaemia, confusion drowsiness aa