Adrenaline and Thyroxine

Question 1

What is adrenaline?

Answer 1

A hormone which prepares you for the “flight or fight mode”

Question 2

Where is adrenalin released?

Answer 2

Adrenaline is released from the adrenal glands.

Question 3

List 4 impacts of adrenaline in the body

Answer 3

adrenaline increases blood pressure as it binds to receptors in the heart therefore causing the heart muscles to contract more frequently and with more force.

Increase in blood flow to the muscles where oxygen and glucose is received for respiration

Releases glucose because it binds to the liver and causes the break down of glycogen

increase in blood glucose level so there is no more glucose in the blood to be transported.

Question 4

Which hormone is in charge of regulating metabolic rate?

Answer 4

Thyroxine is in charge of regulating metabolic rate.

Question 5

Where is thyroxine released from?

Answer 5

Thyroxine is released from the thyroid gland.

Question 6

Describe what happens when the thyroxine levels increase.

Answer 6

Less TRH is released from the hypothalamus
this causes a decrease in the amount out TSH released from the pituitary gland.
therefore decreasing the amount of thyroxine released from the thyroid gland.

Question 7

What are the effects of adrenalin?

Answer 7

Pupils dilate to allow more light in

Blood from digestive system is redirected to the skeletal muscles.

Question 8

Which is a negative feedback loop and why?

Adrenaline or Thyroxine

Answer 8

Thyroxine is the negative feedback loop because it is constantly detecting changes and therefore needed to maintain a controlled internal environment.

Question 9

What is the role of the pituitary gland in metabolic Rate?

Answer 9

It releases thyroid stimulating hormone