Final answer:
Estrogen, testosterone, and growth hormone, in addition to PTH, calcitonin, and calciferol, are hormones that play a role in regulating calcium levels in the body.
Step-by-step explanation:
Apart from parathyroid hormone (PTH), calcitonin (CT), and calciferol (vitamin D), other hormones involved in calcium homeostasis include the sex hormones estrogen and testosterone, as well as growth hormone. Estrogen helps maintain bone density by inhibiting bone resorption and promoting bone formation, while testosterone increases bone density and strength. Growth hormone stimulates bone growth and increases calcium retention. Calcitriol, which is activated by PTH, also plays a significant role in calcium homeostasis as it increases calcium absorption in the intestines.