Changes

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]]:  

#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.