Identify hormones not antagonistic in function

Options

A. MSH - Melatonin
B. Calcitonin- Parathormone
C. Adrenaline- Noradrenaline
D. Insulin- Glucagon.

Answer

To identify hormones that are not antagonistic in function, we need to analyze the given pairs of hormones and determine if their actions are opposite or complementary. Here’s a step-by-step solution:

### Step 1: Understand Antagonistic Hormones
Antagonistic hormones are those that have opposite effects on the same physiological function. For example, one hormone may increase a certain level in the body while another decreases it.

### Step 2: Analyze Each Pair of Hormones
We will go through each option provided to see if they are antagonistic or not.

1. **MSH (Melanocyte Stimulating Hormone) and Melatonin**
- MSH stimulates melanocytes, leading to increased pigmentation (darkening of skin).
- Melatonin decreases pigmentation (lightening of skin).
- **Conclusion**: These hormones are antagonistic.

2. **Calcitonin and Parathormone**
- Calcitonin decreases blood calcium levels.
- Parathormone increases blood calcium levels.
- **Conclusion**: These hormones are antagonistic.

3. **Adrenaline and Noradrenaline**
- Both hormones are produced in response to stress and work together to prepare the body for a 'fight or flight' response.
- They increase heart rate, breathing rate, and alertness.
- **Conclusion**: These hormones are not antagonistic; they work together.

4. **Insulin and Glucagon**
- Insulin decreases blood glucose levels by promoting cellular uptake.
- Glucagon increases blood glucose levels by promoting glycogen breakdown.
- **Conclusion**: These hormones are antagonistic.

### Step 3: Identify the Correct Answer
From the analysis, the only pair of hormones that are not antagonistic is **Adrenaline and Noradrenaline**. Therefore, the correct answer is:

**Answer: Adrenaline and Noradrenaline**

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