Lesson 12: Negative Feedback

Question 1

When is adreneline produced?
What is adreneline produced by?

Answer 1

• Produced in times of fear/ stress.
• By the adrenal glands.

Question 2

What effect does adreneline have on the body?

Answer 2

• It increases heart rate and boosts the delivery of glucose and oxygen to the brain and muscles, preparing the body for “fight or flight.”

Question 3

Where is thyroxine produced?
What does thyroxine control in the body?

Answer 3

• Thyroxine is produced in the thyroid gland.
• Thyroxine stimulates basal metabolic rate/ plays an important role in growth and development.

Question 4

What is the general idea behind a “negative feedback cycle?”

Answer 4

• As a certain substance (ie. thryoxine) in the blood decreases, the body will work to increase that substance.
• As a certain substance (ie. thyroxine) in the blood INCREASES, the body will work to decrease that substance.