The hormone that increases osteoclastic (bone break down) activity to release more calcium ions into the bloodstream is Parathyroid Hormone.
- Low level of Calcium in the blood stream stimulates the release of Parathyroid Hormone from Parathyroid gland.
- This hormone in turn stimulates bone cells to release the stored Calcium thereby increasing Calcium concentration.
- Parathyroid glands are located on the back side of Thyroid gland.
- These glands are responsible for the regulation of Calcium and Phosphorus.
- Calcium levels in blood and body should be equal and Calcium perform various functions of body such as Muscle contraction, Blood clotting, Bone rigidity.
- Hence any disturbance in the harmony of Calcium between blood and bone triggers release of Parathyroid Hormone from the Parathyroid gland.
Therefore from the above points we can conclude that Para Thyroid Hormone increases osteoclastic activity.
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Explanation:
B. Cytoplasm- is made up of a jelly-like substance composed of mainly water and found between the cell membrane and nucleus. The cytoplasm makes up most of the body cells which hold organelles as well.