Hello, I'm an expert in the field of physiology and biochemistry. Let's dive into the effects of adrenaline on the body.

Adrenaline, also known as epinephrine, is a hormone and neurotransmitter that is released by the adrenal glands in response to stress or the "fight or flight" response. Here's what it does:


1. Increases Heart Rate: Adrenaline speeds up the heart rate, which increases blood flow to the muscles and vital organs.

2. Dilates Pupils: It causes the pupils to dilate, allowing for better vision in low light conditions.

3. Enhances Muscle Strength: It provides a temporary boost in muscle strength and endurance.

4. Metabolism Boost: Adrenaline increases the metabolic rate, breaking down glycogen into glucose for quick energy.

5. Blood Vessel Constriction: It constricts most blood vessels, redirecting blood away from non-essential areas to the heart, brain, and muscles.

6. Pain Reduction: It can reduce the perception of pain by acting on the central nervous system.
7.
Blood Clotting: It promotes blood clotting to prevent excessive bleeding in case of injury.
8.
Immune System Suppression: It can temporarily suppress the immune system to reduce inflammation and focus on immediate threats.

Adrenaline plays a crucial role in preparing the body for immediate action in emergency situations. However, prolonged exposure to high levels of adrenaline can lead to negative health effects, such as hypertension and increased risk of heart attack.

read more >>

Key actions of adrenaline include increasing the heart rate, increasing blood pressure, expanding the air passages of the lungs, enlarging the pupil in the eye (see photo), redistributing blood to the muscles and altering the body's metabolism, so as to maximise blood glucose levels (primarily for the brain).read more >>