Adrenaline and thyroxine (HT ONLY)

Adrenaline is produced by the adrenal glands in times of fear or stress, preparing the body for ‘flight or fight,’ increasing heart rate, blood pressure, and blood glucose levels, boosting the delivery of oxygen and glucose to the brain and muscles for respiration. Levels are not controlled by negative feedback.
Thyroxine is produced by the thyroid gland and stimulates the basal metabolic rate. It plays an important role in growth and development. Levels are controlled by negative feedback, maintaining the levels within certain limits.

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