1. Calcium(mineral)
    • Most abundent mineral in the body
    • Ions are vital to:
    • Membranes
    • Neurons
    • Muscle cells(contraction)-Heart muscle
  2. Calcitriol
    • Made in kidneys
    • Helps absorb calcium and phosphorus from the digestive tract and increases blood calcium levels
    • Need vitamin D3(cholecalciferol) to make(made in skin)
  3. Calcitonin
    • Location: Thyroid Gland(C cells)
    • Effects: Inhibits osteoclasts activity
    • Promotes calcium loss at kidneys
    • Reduces calcium ion concentrations in body fluids
  4. Parathyroid hormones(PTH)
    • Location: Parathyroid Glands
    • Functions: Stimulates osteoclast (and osteoblast lesser degree) activity
    • Elevates calcium ion concentration in body fluids
  5. Growth hormones
    • Location: Pituitary Gland
    • Functions: Stimulates osteoblast activity and the synthesis of bone matrix
  6. Thyroxine
    • Location: Thyroid Gland(follicle cells)
    • Functions: W/Growth hormone, stimulates osteoblasts activity and the synthesis of bone matrix
  7. Sex hormones
    • Location: Ovaries(estrogens)
    • Testes(androgens)
    • Functions: Stimulates osteoblast activity andsynthesis of bone matrix
  8. Factors that contribute to healthy bones
    • Vit C-required for collagen synthesis
    • Vit A- stimulates osteoblast activity
    • Vit K&B12- helps synthesis bone proteins
    • Growth Hormones&thyroxine- stimulates bone growth
    • Estrogens&Androgens- stimulates osteoblasts in puberty which leads to the closing of epiphyseal cartilage
    • Calcitonin&Parathyroid homone(w/cacitriol) regulate calcium & phosphate levels
Card Set
Hormones(Calcium Homeostasis)