Parathyroid hormone acts to increase blood calcium levels, while calcitonin acts to decrease blood calcium levels. When blood calcium levels drop below a certain point, calcium-sensing receptors in the parathyroid gland are activated, and the parathyroid glands release a parathyroid hormone into the blood.
Explanation:
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Which of the following sex and generation combinations directly produces the pollen tube of angiosperms? a) male gametophyteb) female gametophytec) male sporophyted) female sporophyte