Adrenaline and thyroxine

Adrenaline causes changes in the body to prepare for a ‘fight or flight’ response.

• Increase in heart rate

• increase in blood sugar levels

• increase blood flow to muscles

• increased blood pressure

Adrenaline causes the conversion of which substances? 

Glycogen →glucose

Which type of feedback is involved in the regulation of thyroxine levels?

Negative feedback

Describe what will happen when thyroxine levels are too high.

• Thyroxine inhibits the pituitary gland from producing tsh

• Less TSH means less thyroxine is produced

• This lowers the level of thyroxine and causes it to fall back down to a normal level

• This is called negative feedback