SB7b

Question 1

What is metabolic rate?

Answer 1

the rate at which the energy stored in food is used by the body

Question 2

What controls metabolic rate?

Answer 2

Metabolic rate is controlled by thyroxine.

Question 3

What gland produces thyroxine?

Answer 3

Thyroxine is produced and released by the thyroid gland

Question 4

How does thyroxine change affect metabolic rate?

Answer 4

In body cells, thyroxine causes a faster break down of proteins and carbohydrates (sugars

Question 5

What does negative feedback do?

Answer 5

Brings the homeostatic process back
to normal levels.

Question 6

What are the Effects of adrenaline?

Answer 6

 Heart rate and breathing rate increase.

 Respiration increases (more glucose released in the blood) to produce more energy.
 Pupils in eye become wider.

 Less blood going to the digestive system – more blood going to the
muscle delivering oxygen for respiration.

 Arteries dilate (become wider) – for more blood to pass through.