NTS 135 Lecture Notes - Vitamin D Deficiency, Tetany, Hydroxylapatite

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8 Dec 2022
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What factors reduce calcium absorption: functions of calcium. Bone growth, maintenance, and repair: calcium: 40% of all minerals in body, 99% of calcium is used for bone growth, development, and maintenance, main component of hydroxyapatite. Muscle and nerve function: muscle contraction activation release of neurotransmitters for nerve transmission. Regulation of cellular metabolism: activities of enzymes and hormonal responses, maintaining cell integrity, promoting cell differentiation, blood clot formation, calcium deficiency. Average u. s. intake: 800 milligrams per day for women, 1,000 milligrams per day for men. Rule of 300s used to estimate calcium intake: 300 milligrams for food consumed throughout the day, 300 milligrams for each cup of milk or yogurt or 1. 5 ounces of cheese, calcium absorption. Enhanced by: increased levels of parathyroid hormone (pth) and vitamin d: high need growth, pregnancy, lactation, consuming foods containing lactose, slow movement of digestive contents through intestine, acidic environment of stomach. Dairy products: provide about 75% of calcium in north american dietary patterns.

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