Podcast
Questions and Answers
Which of the following is NOT a biological role of calcium?
Which of the following is NOT a biological role of calcium?
In the plasma, blood calcium is present in 3 fractions, except:
In the plasma, blood calcium is present in 3 fractions, except:
Which of the following factors diminishes intestinal transport of calcium?
Which of the following factors diminishes intestinal transport of calcium?
What happens to any extra calcium absorbed from the intestine in a normal adult?
What happens to any extra calcium absorbed from the intestine in a normal adult?
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What is the influence of Vitamin D on calcium absorption?
What is the influence of Vitamin D on calcium absorption?
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How do organic acids, lactose, and basic amino acids in the diet affect calcium absorption?
How do organic acids, lactose, and basic amino acids in the diet affect calcium absorption?
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What dietary factor decreases the absorption of calcium?
What dietary factor decreases the absorption of calcium?
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How does a high calcium intake affect its absorption?
How does a high calcium intake affect its absorption?
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What is the main consequence of a decrease in ionized calcium in the serum?
What is the main consequence of a decrease in ionized calcium in the serum?
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How much calcium, on average, is absorbed from the diet and how much is excreted as fecal calcium?
How much calcium, on average, is absorbed from the diet and how much is excreted as fecal calcium?
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What is the primary route of excretion for calcium in the body?
What is the primary route of excretion for calcium in the body?
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How does vigorous physical exercise affect calcium loss in the body?
How does vigorous physical exercise affect calcium loss in the body?
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Study Notes
Calcium Roles and Absorption
- Calcium has various biological roles, excluding:
- Blood clotting
- In the plasma, blood calcium is present in 3 fractions, excluding:
- Albumin-bound fraction
Calcium Absorption
- Factors that diminish intestinal transport of calcium:
- Oxalic acid and phytic acid
- In a normal adult, extra calcium absorbed from the intestine is:
- Deposited in bones
- Vitamin D's influence on calcium absorption:
- Increases calcium absorption
- Organic acids, lactose, and basic amino acids in the diet:
- Increase calcium absorption
- Dietary factor that decreases calcium absorption:
- Phosphorus
- High calcium intake's effect on its absorption:
- Decreases absorption efficiency
- Main consequence of a decrease in ionized calcium in the serum:
- Tetany (muscle cramps)
Calcium Balance and Excretion
- Average calcium absorbed from the diet:
- 200-300 mg/day
- Average calcium excreted as fecal calcium:
- 150-200 mg/day
- Primary route of excretion for calcium in the body:
- Kidneys (via urine)
- Vigorous physical exercise's effect on calcium loss:
- Increases calcium loss in the body, particularly in the urine
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Description
This quiz covers the factors influencing calcium absorption, including the effects of parathyroid hormone, adrenal glucocorticoids, aging, and kidney threshold. It also tests knowledge on the excretion of excess calcium in a normal adult.
