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What is negative feedback?
A type of control where the body responds to an increase or decrease in a factor by returning it to the optimum level.
What is thyroxine?
A hormone released by the thyroid gland.
Its release is triggered by the thyroid stimulating hormone (TSH).
Thyroxine controls the body’s metabolic rate, growth, and development.
How is the release of thyroxine controlled by negative feedback?
Levels of blood thyroxine falls - detected by receptors in the brain.
Pituitary gland releases more TSH.
More thyroxine produced and released by the thyroid gland.
Blood thyroxine level returns to normal.
What is adrenaline?
A hormone secreted by the adrenal gland in times of stress. It is responsible for the “fight or flight” response.
What are the effects of adrenaline?
Increase in heart and breathing rate - delivers oxygen and glucose to the body.
Stored glycogen converted to glucose.
Dilation of pupils.
Increased mental awareness.
Blood diverted away from digestive system to muscles.
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