**Question:** Adrenal medulla secretes all EXCEPT:

A. Adrenaline
B. Noradrenaline
C. Progesterone
D. Thyroxine

**Core Concept:**
Adrenal medulla is a part of the adrenal glands, which are located above the kidneys. The adrenal medulla plays a crucial role in the body's stress response and regulation of blood pressure. It secretes two key neurotransmitters: adrenaline (also known as epinephrine) and noradrenaline (also known as norepinephrine). Both adrenaline and noradrenaline are involved in the body's stress response, increasing heart rate, blood pressure, and readying the body for action.

**Why the Correct Answer is Right:**
Adrenal medulla does not secrete progesterone, as progesterone is a steroid hormone produced in the adrenal cortex, not the medulla. Progesterone plays a role in pregnancy, maintaining the endometrium, and regulating the menstrual cycle.

**Why Each Wrong Option is Incorrect:**
A. Adrenaline: Correct, an important neurotransmitter in the stress response.
B. Noradrenaline: Correct, another important neurotransmitter in the stress response.
C. Progesterone: Incorrect, not produced by adrenal medulla but by adrenal cortex.
D. Thyroxine: Incorrect, a thyroid hormone, not produced by adrenal medulla or cortex.

**Clinical Pearl:**
Adrenal medulla secretions are vital for maintaining homeostasis in response to stress, while progesterone is crucial for reproductive functions. Misunderstanding this distinction can lead to incorrect diagnosis and treatment plans in clinical practice.