Calcium Homeostasis
Endocrinology
aka Ca
Absorption:
Storage:
Excretion:
aka Ca
Absorption:
- Parathyroid hormone increases Kidney conversion of Vit D into Calcitriol
- Calcitriol aids duodenal Ca absorption (active) via calbindin, has no effect of rest of small intestine (passive, and only at high levels of Ca)
Storage:
- 99% stored in bone
- Calcitriol shifts balance to calcium and phosphate release
Excretion:
- Calcitriol reduces phosphate resorption leaving more Ca free in blood