With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Ryan Seacrest is a television host.
text_B: Calcium metabolism refers to all the movements -LRB- and how they are regulated -RRB- of calcium atoms and ions into and out of various body compartments , such as the gut , the blood plasma , the interstitial fluids which bathe the cells in the body , the intracellular fluids , and bone .. blood plasma. blood plasma. calcium. calcium. An important aspect , or component , of calcium metabolism is plasma calcium homeostasis , which describes the mechanisms whereby the concentration of calcium ions in the blood plasma is kept within very narrow limits .. blood plasma. blood plasma. plasma calcium homeostasis. Homeostasis#Plasma ionized calcium. calcium. calcium. Derangements of this mechanism lead to hypercalcemia or hypocalcemia , both of which can have important consequences for health .. hypercalcemia. hypercalcemia. hypocalcemia. hypocalcemia. In humans , when the blood plasma ionized calcium level rises above its set point , the thyroid gland releases calcitonin , causing the plasma ionized calcium level to return to normal .. blood plasma. blood plasma. calcium. calcium. thyroid gland. thyroid gland. calcitonin. calcitonin. When it falls below that set point , the parathyroid glands release parathyroid hormone -LRB- PTH -RRB- , causing the plasma calcium level to rise .. calcium. calcium. parathyroid glands. parathyroid glands. parathyroid hormone. parathyroid hormone
not_related.