Changes

#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 in the [[Parathyroid Glands - Anatomy & Physiology|Parathyroid Glands]], the C-Cells (also called parafollicular cells) of the [[Thyroid Gland - Anatomy & Physiology|Thyroid Gland]] and the kidneys.  

#Hormonal regulation - calcium levels in the body are regulated by hormones produced in the [[Parathyroid Glands - Anatomy & Physiology|Parathyroid Glands]], the C-Cells (also called parafollicular cells) of the [[Thyroid Gland - Anatomy & Physiology|Thyroid Gland]] and the kidneys.  

 

#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 level 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.

#C-Cells of the thyroid gland secrete '''Calcitonin''' which '''DECREASES''' calcium levels in the blood.

*'''C-Cells''' of the Thyroid Gland secrete '''Calcitonin''' which DECREASES Calcium level in the blood.