Calcium Flashcards
1
Q
enhancing absorption factors for calcium
A
- acidity chyme-absorbed in acidic part of duodenum
- pregnancy deficiency
- lactose
- V-D stimulation production of Ca
2
Q
decreasing absorption factors for calcium
A
- increase Ca intake
- oxalate/phytate
- fiber
- steatorrhea (fat in stool)
- age
3
Q
calcium absorption rate
A
- 200 md/d = 30%
- 800 mg/d = 15%
- children = 75%
4
Q
calcium distribution
A
- bone = 99%
- blood and ECF = 1%
- regulation of Ca concentration
- -extracellular-10-3 M
- -cytosol-10-7 M
5
Q
physiological importance of calcium
A
- neuromuscular excitability
- blood coagulation
- hormonal secretion
- enzymatic regulation
6
Q
calcium homeostasis
A
- parathyroid hormone
- V-D3
- calcitonin
7
Q
PTH role in calcium homeostasis
A
- secreted when plasma Ca decreases
- stimulation bone resorption
- inhibits bone formation/mineralization
- stimulation synthesis of calcitriol
- stimulation renal absorption
8
Q
calcitiol (V-D3) role in calcium homeostasis
A
- stimulating GI absorption of Ca/phosphate
- stimulating renal absorption Ca/phosphate
- stimulating bone resorption
9
Q
calcitonin role in calcium homeostasis
A
- secreted by thyroid gland
- suppresses bone resorption
- increases kidney excretion
10
Q
calcium recommendation
A
- AI:
- -18-19 = 1300 mg/d
- -19-50 = 1000 mg/d
- -50+ = 1200 mg/d
- -osteoporosis = 1500 mg/d
-UL = 2500 mg/d
11
Q
calcium deficiency
A
- tetany
- osteoporosis
12
Q
calcium food sources
A
- milk
- yogurt
- OJ
- cheese
- ice cream
- soy milk
- broccoli
- leafy greens
- tofu
- sardines
13
Q
calcium supplement
A
- Ca carbonate = 39%
- Ca acetate = 32%
- Ca citrate = 30%
