Biology - Chemical Coordination and Integration Question with Solution | TestHub

Parathyroid hormone (PTH) increases the calcium level in the blood by stimulating bone resorption or demineralization.

Hypersecretion of PTH leads to excessive breakdown of the bone matrix, making bones brittle, weak, and prone to fractures. This condition is known as osteoporosis.

Calcitonin has the opposite effect, promoting calcium deposition in bones, while somatostatin and adrenaline are not directly responsible for osteoporosis.

Answer: hypersecretion of PTH