Which one of the following groups of structures is involved in regulating calcium levels?

A. Parathyroid, thymus, intestines, kidneys, and bones.
B. Parathyroid, bones, intestines, kidnesy, and adrenal glands.
C. Thyroid, parathyroid, bones, intestines, and adrenal glands.
D. Thyroid, Parathyroid, bones, intestines, and kidneys.
Any serious help please? I'm thinking D, but am not sure.thanks in advance

The problem I have in D is it does not include the endocrine gland skin, where Vitamin D (as a hormone) is synthesized, and it has a great role in regulating calcium levels.

ok, any other suggestions

Other than that, D is a sensible response.

To determine which group of structures is involved in regulating calcium levels, we need to understand the functions of each structure.

The parathyroid glands secrete parathyroid hormone (PTH), which plays a crucial role in calcium regulation. PTH acts on the bones, intestines, and kidneys to increase the levels of calcium in the blood.

The thyroid gland produces thyroid hormones that regulate metabolism but not directly involved in calcium regulation.

The thymus gland plays a role in the development of the immune system and is not directly involved in calcium regulation.

The adrenal glands produce hormones like cortisol and adrenaline, which are involved in the stress response and not specifically related to calcium regulation.

Now, let's analyze the given options:

A. Parathyroid, thymus, intestines, kidneys, and bones.
- The parathyroid gland is included, which is correct.
- The thymus gland is mentioned, which is not involved in calcium regulation.
- Hence, Option A is not the correct answer.

B. Parathyroid, bones, intestines, kidneys, and adrenal glands.
- The parathyroid gland is included, which is correct.
- The bones, intestines, and kidneys are also involved in calcium regulation as mentioned earlier.
- The adrenal glands, although they produce hormones, are not directly involved in calcium regulation.
- Hence, Option B is not the correct answer.

C. Thyroid, parathyroid, bones, intestines, and adrenal glands.
- The parathyroid gland is included, which is correct.
- The thyroid gland is not directly involved in calcium regulation.
- The bones and intestines are involved in calcium regulation.
- The adrenal glands, as explained earlier, are not directly involved in calcium regulation.
- Hence, Option C is not the correct answer.

D. Thyroid, Parathyroid, bones, intestines, and kidneys.
- The parathyroid gland is included, which is correct.
- The thyroid gland, although not involved in calcium regulation, is included in this option.
- The bones, intestines, and kidneys are involved in calcium regulation.
- Hence, Option D is the correct answer.

Therefore, the correct answer is option D.