Adrenaline

• What is adrenaline and where is it produced?

  Adrenaline is a hormone produced by the adrenal glands (above the kidneys). It prepares the body for "fight or flight" in stressful situations.
• How does adrenaline affect the body?

  • Increases heart rate → More oxygen and glucose to muscles.
  • Expands airways → Improves oxygen supply.
  • Breaks down glycogen in the liver → Releases glucose for energy.
  • Diverts blood to muscles → Enhances reaction speed.
• How is adrenaline released?

  • Nervous signals from the brain trigger the adrenal glands to release adrenaline when the body is under stress, fear, or excitement.
  • It is not controlled by negative feedback.