Negative Feedback

Cards (21)

  • What is the endocrine system responsible for?
    Releasing hormones directly into the bloodstream
  • 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?
    To increase the heart rate
  • Why does the heart rate increase when adrenaline is released?
    To deliver more oxygen and glucose to muscles
  • What is the term used to describe 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 the level of thyroxine 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 triggers the thyroid gland to release more thyroxine?
    TSH in the bloodstream
  • What happens when the thyroxine level increases?
    The brain prevents TSH release
  • What occurs if thyroxine levels become too high?
    Events are triggered to lower thyroxine
  • What is a negative feedback cycle?
    A process that regulates hormone levels
  • Can you name other negative feedback cycles in the human body?
    Blood glucose control and menstrual cycle
  • What are the roles of thyroxine and adrenaline in the body?
    • Thyroxine:
    • Stimulates metabolic rate
    • Aids in growth and development
    • Adrenaline:
    • Increases heart rate
    • Prepares body for fight or flight
  • What is the general idea behind negative feedback?
    • Monitors hormone levels
    • Triggers responses to maintain balance
    • Prevents overproduction or underproduction
  • What glands are primarily involved in the release of thyroxine and adrenaline?
    • Thyroid gland: Releases thyroxine
    • Adrenal glands: Release adrenaline