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Adrenal medulla secretes -...

Adrenal medulla secretes -

A

Adrenaline / epinephrine only

B

Nor- adrenaline / nor-epinephrine

C

a and b

D

Corticoids

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**Step-by-Step Text Solution:** 1. **Understanding the Adrenal Gland Structure**: The adrenal gland is divided into two main parts: the outer layer known as the adrenal cortex and the inner layer known as the adrenal medulla. 2. **Function of the Adrenal Cortex**: The adrenal cortex is responsible for producing various hormones, including glucocorticoids, mineralocorticoids, and sex corticoids. These hormones play vital roles in metabolism, immune response, and regulation of blood pressure. 3. **Function of the Adrenal Medulla**: The adrenal medulla, on the other hand, is responsible for producing two key hormones: epinephrine (also known as adrenaline) and norepinephrine (also known as noradrenaline). 4. **Role of Epinephrine and Norepinephrine**: - **Epinephrine (Adrenaline)**: This hormone is primarily involved in the body's fight-or-flight response, increasing heart rate, blood flow to muscles, and energy availability. - **Norepinephrine (Noradrenaline)**: Similar to epinephrine, norepinephrine also plays a crucial role in the fight-or-flight response and is involved in regulating blood pressure and heart rate. 5. **Emergency Situations**: Both hormones are released during stressful situations, preparing the body to respond to emergencies (often referred to as the "3F" response: fear, fight, and flight). 6. **Identifying the Correct Answer**: Given the options: - Option 1: Epinephrine (Adrenaline) - Option 2: Norepinephrine (Noradrenaline) - Option 3: Both A and B - Option 4: Corticoids (which are produced by the adrenal cortex) The correct answer is Option 3, as both epinephrine and norepinephrine are secreted by the adrenal medulla.
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