Bone Health Regulation Flashcards
Bone mass peaks by what age?
Mid-20’s
How long does someone maintain their bone mass after reaching their peak?
10 years
After age 35, both men and women will lose ____-____% of their bone density per year. What is this part of?
0.3-0.5; the aging process
Less than ___% of bone loss during lifespan occurs before menopause.
50%
What accelerates bone loss rapidly in first postmenopausal decade?
Estrogen deficiency
Define bone turnover
Rates of deposition and absorption are equal so that total mass remains constant.
Bone turnover=
Remodeling
What percentage of bone mass turns over in a single year?
15%
What is the normal range of plasma calcium?
8.5-10.5 mg/dl
Describe what happens in hypocalcemia.
Increased neuromuscular excitability
Hypocalcemia results in increased neuronal membrane permeability to _____
Sodium
Hypocalcemia side effects
Muscle spasms, tetany, cardiac dysfunction
Tetany occurs at what plasma calcium level
6 mg/dl
Hypercalcemia results in _____ nervous system and muscle activity.
Depressed
Hypercalcemia occurs at what plasma calcium level?
12 mg/dl
