Which of the following hormones coordinate with each other to maintainj ideal blood Ca level?

Options

A. Thyrocalcitonin and glucagon
B. Parathyroid hormone and cortisol
C. Thyrocalcitonin and Thyroxin
D. Thyrocalcitonin and Parathyroid hormone

Answer

To answer the question regarding which hormones coordinate to maintain ideal blood calcium levels, we need to analyze the options provided and understand the roles of the hormones mentioned.

### Step-by-Step Solution:

1. **Identify the Hormones**: The question provides four pairs of hormones:
- Thyrocalcitonin and glucagon
- Parathyroid hormone and cortisol
- Thyrocalcitonin and thyroxin
- Thyrocalcitonin and parathyroid hormone

2. **Understand Thyrocalcitonin**:
- Thyrocalcitonin, also known as calcitonin, is a hormone secreted by the thyroid gland. Its primary function is to lower blood calcium levels by inhibiting osteoclast activity (cells that break down bone) and promoting calcium deposition in bones.

3. **Understand Parathyroid Hormone (PTH)**:
- Parathyroid hormone is produced by the parathyroid glands and works to increase blood calcium levels. It does this by stimulating osteoclasts to release calcium from bones, increasing calcium reabsorption in the kidneys, and promoting the activation of vitamin D to increase intestinal absorption of calcium.

4. **Evaluate the Coordination**:
- Thyrocalcitonin and parathyroid hormone have opposing effects on blood calcium levels. When calcium levels are high, thyrocalcitonin is released to lower them, and when calcium levels are low, parathyroid hormone is released to raise them. This antagonistic relationship allows for the fine-tuning of calcium levels in the blood.

5. **Analyze Other Options**:
- **Thyrocalcitonin and glucagon**: Glucagon primarily regulates blood glucose levels and does not play a role in calcium regulation.
- **Parathyroid hormone and cortisol**: Cortisol is a steroid hormone that influences metabolism and immune response but does not directly regulate calcium levels.
- **Thyrocalcitonin and thyroxin**: Thyroxin (T4) is involved in metabolic processes but does not have a direct role in calcium regulation.

6. **Conclusion**: The hormones that coordinate with each other to maintain ideal blood calcium levels are **thyrocalcitonin and parathyroid hormone**.

### Final Answer:
The correct option is **thyrocalcitonin and parathyroid hormone**.