B5- Adrenaline And Thyroxine Flashcards
What is adrenaline?
A hormone released by the adrenal glands in response to stress or fear
Adrenaline prepares the body for ‘fight or flight’ by increasing oxygen and glucose supply to cells.
What triggers the release of adrenaline?
Stressful or scary situations detected by the brain
The brain sends nervous impulses to the adrenal glands to secrete adrenaline.
What effect does adrenaline have on heart rate?
Increases heart rate
This is part of the body’s preparation for ‘fight or flight’.
What is negative feedback in hormone release?
A system that regulates hormone levels by triggering responses to restore normal levels
It occurs when the body detects hormone levels above or below normal.
What is thyroxine?
A hormone released by the thyroid gland that regulates metabolism
Thyroxine is made from iodine and amino acids.
What role does thyroxine play in the body?
Regulates the basal metabolic rate and stimulates protein synthesis for growth and development
It is crucial for many processes in the body.
What hormone stimulates the release of thyroxine?
Thyroid stimulating hormone (TSH)
TSH is released from the pituitary gland.
How does negative feedback regulate thyroxine levels?
When thyroxine levels are high, TSH secretion is inhibited, reducing thyroxine release
This process helps maintain normal levels of thyroxine in the blood.
Fill in the blank: The thyroid gland is located in the _______.
Neck
True or False: Adrenaline decreases the supply of oxygen and glucose to the brain and muscles.
False
Adrenaline increases the supply of oxygen and glucose.
What happens when the level of thyroxine in the blood is lower than normal?
TSH is released again
This increases thyroxine production to restore normal levels.
