Adrenaline And Thyroxin Flashcards
What is a fight or flight experience?
It is when your brain has a split decision to either fight or back off , this increases supply of oxygen and glucose to cells.
When It detects a stressful situation the brain sends signals to the adrenal glands , which secrete adrenaline .
What happens when adrenaline is released into the blood?
Adrenaline binds to specific receptors in the heart, causes blood pressure and heart rate to increase.
This increases blood to muscles , so cells get more oxygen and glucose
Adrenaline also binds to liver , this causes the liver to break down glucose in its glycogen stores to release glucose .
This causes increased blood glucose levels, so there is more glucose for possible fighting.
What is negative feedback ?
When the body adjusts and uses the organs to change the levels of blood eg back to normal.
What does thyroxine regulate and where does it get released from?
Regulated metabolism
And it is made in the thyroid gland
What happens when thyroxine levels are too high and low?
High = thyrotropin releasing hormone(TRH) from the hypothalamus is inhibited, reduces thyroid stimulating hormone(TSH) - reducing thyroxine in blood
Low = hypothalamus releases TRH , this then release TSH from the pituitary gland. This causes thyroid gland release thyroxine - thyroxine levels increase.
