1.1- Diet And Exercise

Question 1

What factors cause some people to have higher metabolic rates?

Answer 1

•Tall people have higher metabolic rates, as they lose more heat from their body surface.
• Overweight people have a higher metabolic rate than slimmer people, as their
bodies are larger and need more energy to work.
• People with an underactive thyroid gland have lower metabolic rates.

Question 2

Why do muscle cells need energy from respiration?

Answer 2

Muscle cells are active. They need energy from respiration to contract.

Question 3

If someone has more muscle than fat, do they have a higher/lower metabolic rate?

Answer 3

Higher

Question 4

When you exercise…

Answer 4

• Your muscles contract more to move your limbs - muscles need energy to contract so muscle cells need to respire more to release more
energy from glucose. To provide this glucose, you need to eat more food.
• It increases the amount of energy expended by the body.