Final answer:
PTH can increase calcium concentration by stimulating osteoclasts, promoting calcium reabsorption by the kidney tubules, and indirectly increasing dietary calcium absorption in the intestines.
Step-by-step explanation:
Parathyroid Hormone (PTH) can increase calcium concentration by:
- Stimulating osteoclasts to break down bone matrix and release inorganic calcium-phosphate salts into the circulation.
- Promoting the reabsorption of calcium by the kidney tubules, increasing calcium levels in the blood.
- Indirectly increasing dietary calcium absorption in the intestine by triggering the formation of calcitriol, an active form of vitamin D.