Stress response

Stress response

When the sympathetic nervous system is activated, the brain stimulates the adrenal medulla. The cells in the medulla immediately secrete adrenaline (80%) and noradrenaline (20%). These hormones stimulate adrenergic receptors throughout the whole body. Adrenaline mobilises glucose, fatty acids and energy, and increases heart rate and force of muscle contraction.

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I. Acute stress results in higher blood pressure within seconds. II. Chronic stress is mediated by noradrenaline.