Adrenaline and thyroxine

• Hormones are chemical messengers in our body that allow us to respond to changing environments
• Adrenaline is one hormone secreted from the adrenal glands in times of fear or stress
• The brain triggers the release of adrenaline by sending nervous impulses down the body to the adrenal gland
• Adrenaline prepares the body for flight or fight response
• Adrenaline binds to receptors on specific cells, known as target cells
• The effects of adrenaline binding include increased heart rates and increased blood pressure
• There is increased blood flow to the muscles and decreased blood flow to areas like the digestive system