negative feedback

• What is the role of hormones in the body?

  They are chemicals released into the bloodstream
• Which two glands are focused on in the video?

  The adrenal glands and thyroid gland
• Where are the adrenal glands located?

  At the top of the kidneys
• What hormone do the adrenal glands produce during stress?

  Adrenaline
• What is one main effect of adrenaline?

  Increases heart rate
• Why does adrenaline increase heart rate?

  To deliver more oxygen and glucose
• What is the purpose of oxygen and glucose in the body?

  Needed for aerobic respiration
• What is the term used for the body's response to fear or stress?

  Fight or flight
• Where is the thyroid gland located?

  At the base of the neck
• What hormone does the thyroid gland release?

  Thyroxine
• What are the two main effects of thyroxine?

  Stimulates metabolic rate and growth
• What does metabolism refer to?

  The sum of all reactions in a cell
• How is thyroxine level controlled?

  By negative feedback
• What monitors the level of thyroxine in the blood?

  The brain
• What does the pituitary gland release when thyroxine levels fall?

  TSH (Thyroid Stimulating Hormone)
• What does TSH trigger the thyroid gland to do?


  Release more thyroxine
• What happens when thyroxine levels increase?

  Prevents the release of TSH
• What is a negative feedback cycle?

  A process that maintains balance in the body
• Can you name other examples of negative feedback cycles?

  Blood glucose control and menstrual cycle
• What are the roles of thyroxine and adrenaline in the body?

  • Thyroxine: regulates metabolism and growth
  • Adrenaline: prepares body for fight or flight
• What is the general idea behind negative feedback?

  • Monitors levels in the body
  • Triggers responses to maintain balance
  • Inhibits further hormone release when levels are adequate