Question

Which of the following hormones coordinate with each other to maintain ideal blood Ca level?
A. Thyrocalcitonin and glucagon
B. Parathyroid hormone and cortisol
C. Thyrocalcitonin and Thyroxine
D. Thyrocalcitonin and Parathyroid hormone

Answer 1

Hormones are the chemical messengers, that are directly secreted in the blood by the endocrine glands (ductless glands). Blood carries these hormones to the particular organ or tissue of the body to exert their functions.

Complete Answer:
Both the hormones thyrocalcitonin and parathyroid coordinate with each other to maintain blood level of Calcium. These hormones act on the bones, kidneys and intestines to keep the Ca level in blood constant. The parathyroid hormone is secreted by the parathyroid gland. Thyrocalcitonin hormone is secreted by the thyroid gland.

Parathyroid hormone:
- Parathyroid hormone is responsible for regulating the blood calcium level. This hormone is released whenever blood calcium level is low.
- Parathyroid hormone increases blood calcium level by stimulating osteoblasts. These osteoblasts (cells from which bones get developed) break down bone to release calcium into the bloodstream.
- The parathyroid hormone also increases the blood calcium level by increasing the amount of calcium reabsorbed by the kidneys before calcium gets excreted in the urine.
- Parathyroid hormone also increases the blood calcium level by triggering the calcitoril, which increases the absorption of calcium from the diet

Thyrocalcitonin hormone:
- Thyrocalcitonin hormone works in opposition of the parathyroid hormone. This hormone decreases the blood calcium level whenever the blood calcium level rises up above the normal value.
- Thyrocalcitonin inhibits the activity of osteoblasts which prevent the breakdown of bones.
This hormone also inhibits the reabsorption of Calcium by the kidney which results in increased amount of calcium excretion with urine.

Additional information:
1. Glucagon – The hormone glucagon is secreted by the pancreas. This hormone helps in increasing the blood sugar level.
2. Cortisol – The hormone cortisol is secreted by adrenal gland. This hormone is called the emergency hormone and plays a role in stress response.
3. Thyroxine – Thyroxine hormone is secreted by the thyroid gland. This hormone helps to control several body functions such as the rate of metabolism and energy levels.

Hence, option D is the correct option for this question.

Note: Along with the thyrocalcitonin thyroid gland also secretes tetraiodothyronine or thyroxine (T4) and triiodothyronine (T3) hormones. Pituitary gland is called the master gland. Pituitary glands play a major role in regulating vital body functions. Pituitary gland controls the activity of many hormone-secreting glands.