Which endocrine gland secretes a hormone that raises blood calcium levels?

• A. Parathyroid gland
• B. Thyroid gland
• C. Adrenal gland
• D. Pituitary gland

Answer: (A)

Verified step by step guidance

1. Step 1: Understand the role of calcium regulation in the body. Blood calcium levels are tightly regulated by hormones to ensure proper functioning of muscles, nerves, and bones.
2. Step 2: Identify the endocrine glands listed in the problem: Parathyroid gland, Thyroid gland, Adrenal gland, and Pituitary gland. Each gland has specific functions and secretes different hormones.
3. Step 3: Recall the function of the parathyroid gland. It secretes parathyroid hormone (PTH), which increases blood calcium levels by stimulating calcium release from bones, increasing calcium absorption in the intestines, and reducing calcium excretion by the kidneys.
4. Step 4: Compare the functions of the other glands: The thyroid gland secretes calcitonin, which lowers blood calcium levels; the adrenal gland secretes hormones like cortisol and adrenaline, which are not directly involved in calcium regulation; and the pituitary gland secretes hormones like growth hormone and ACTH, which also do not regulate calcium levels.
5. Step 5: Conclude that the parathyroid gland is the correct answer because it secretes parathyroid hormone (PTH), which raises blood calcium levels.