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There are regulatory mechanisms which maintain calcium homeostasis:
 
There are regulatory mechanisms which maintain calcium homeostasis:
 
#Buffering - exchangeable calcium is present in bone salts - amorphous calcium phosphate (CaHPO4) is in a state of reversible equilibrium with calcium and phosphorous in extracellular fluid. Exchangeable calcium is alsp present in mitochondria.
 
#Buffering - exchangeable calcium is present in bone salts - amorphous calcium phosphate (CaHPO4) is in a state of reversible equilibrium with calcium and phosphorous in extracellular fluid. Exchangeable calcium is alsp present in mitochondria.
#Hormonal regulation - calcium levels in the body are regulated by hormones produced by the [[Kidney - Anatomy & Physiology|kidneys]], in the [[Parathyroid Glands - Anatomy & Physiology|Parathyroid Glands]] and in the C-Cells (also called parafollicular cells) of the [[Thyroid Gland - Anatomy & Physiology|Thyroid Gland]]:  
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#Hormonal regulation - calcium levels in the body are regulated by hormones produced by the [[Kidney - Anatomy & Physiology|kidneys]], in the [[Parathyroid Glands - Anatomy & Physiology|parathyroid glands]] and in the C-Cells (also called parafollicular cells) of the [[Thyroid Gland - Anatomy & Physiology|thyroid gland]]:  
 
#*Chief cells, also known as ''Principal Cells'', of the parathyroid gland secrete '''Parathyroid Hormone''' (PTH) which '''INCREASES''' calcium levels in the blood.
 
#*Chief cells, also known as ''Principal Cells'', of the parathyroid gland secrete '''Parathyroid Hormone''' (PTH) which '''INCREASES''' calcium levels in the blood.
 
#*The kidneys activate Vitamin D3 to create '''Active Vitamin D3''' also known as '''Calcitriol''' to '''INCREASE''' calcium levels in the blood.
 
#*The kidneys activate Vitamin D3 to create '''Active Vitamin D3''' also known as '''Calcitriol''' to '''INCREASE''' calcium levels in the blood.
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