24 Questions
What percentage of the body's calcium is found in bones and teeth?
99%
Which of the following is a good source of calcium according to the text?
1 small carton of yoghurt
What is the Recommended Dietary Allowance (RDA) of calcium for individuals aged 18+ years?
1200mg
What percentage of calcium is absorbed actively in the small intestine?
30%
What is the plasma concentration of Ca+?
9-10.4 mg/100 ml
Which physiological factor affects calcium absorption?
Pregnancy
What is the main function of calcium in the body?
Bone structure
Which of the following contributes to dietary factors affecting calcium absorption?
Oxalates and phytates in foods
What is the calcium intake recommendation for individuals aged 1-10 years?
1000mg
Which vitamin is essential for calcium deposition?
Vitamin D
What percentage of calcium is found in body fluids such as blood and extracellular fluid?
1%
What is the calcium intake recommendation for individuals aged 11-17 years?
1200mg
What is the normal range for plasma Ca+ concentration?
9-10.4 mg/100 ml
Which hormone inhibits vitamin D and prevents reabsorption of calcium?
Calcitonin
What is the function of parathyroid hormone (PTH) and vitamin D in calcium metabolism?
Stimulate calcium reabsorption
What is the role of calcitonin in response to rising blood calcium levels?
Inhibits resorption and prevents reabsorption
What is the consequence of high blood calcium in calcium metabolism?
Bone demineralisation
What is the function of osteoclasts in calcium metabolism?
Mobilization of calcium
What is the definition of osteoporosis according to the World Health Organization (WHO)?
BMD more than −2.5 SD below the young adult mean
What is the upper limit for calcium intake to avoid toxicity?
2500 mg/day
What are the potential consequences of calcium toxicity?
Calcification of soft tissue
What are the consequences of calcium deficiency?
Reduced bone mass
What is the method used to assess bone mineral density (BMD)?
Dual-energy X-ray absorptiometry (DEXA)
What is the role of adequate calcium intake in relation to skeletal growth?
Essential for peak bone mass (PBM)
Test your knowledge of human nutrition with this quiz on understanding nutrients, focusing on calcium. Learn about the role of calcium in the body, its abundance, and distribution in bones, teeth, and body fluids.
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