Which of the following pairs of hormones are not antagonistic (having opposite effects) to each other ?

Options

A. Insuline - Glucagon
B. Aldosterone - Atrial Natriuretic Factor
C. Relaxin - Inhibin
D. Parathormone - Calcitonin

Answer

To determine which pairs of hormones are not antagonistic to each other, we need to analyze the functions of the hormones provided in the question.

### Step-by-Step Solution:

1. **Identify the Hormones and Their Functions**:
- **Insulin**: Secreted by the beta cells of the pancreas; it lowers blood sugar levels by increasing glucose uptake in cells.
- **Glucagon**: Secreted by the alpha cells of the pancreas; it raises blood sugar levels by promoting glycogen breakdown and glucose release into the bloodstream.
- **Aldosterone**: A mineralocorticoid hormone secreted by the adrenal cortex; it promotes sodium retention and potassium excretion, thus regulating electrolyte balance.
- **Atrial Natriuretic Factor (ANF)**: Secreted by the heart; it promotes sodium excretion and opposes the action of aldosterone.
- **Relaxin**: Secreted by the placenta; it helps in childbirth by relaxing the cervix.
- **Inhibin**: Secreted by the ovaries; it inhibits the secretion of follicle-stimulating hormone (FSH) but does not have an antagonistic effect on relaxin.
- **Parathormone (PTH)**: Secreted by the parathyroid glands; it increases blood calcium levels by promoting calcium release from bones.
- **Calcitonin**: Secreted by the thyroid gland; it lowers blood calcium levels by promoting calcium deposition in bones.

2. **Analyze the Hormonal Relationships**:
- **Insulin vs. Glucagon**: Antagonistic (opposite effects).
- **Aldosterone vs. ANF**: Antagonistic (opposite effects).
- **Relaxin vs. Inhibin**: Not antagonistic (different functions, no opposite effects).
- **Parathormone vs. Calcitonin**: Antagonistic (opposite effects).

3. **Conclusion**:
The pair of hormones that are **not antagonistic** to each other is **Relaxin and Inhibin**.

### Final Answer:
The pair of hormones that are not antagonistic to each other is **Relaxin and Inhibin**.

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