Exercise

Question 1

An ________ in muscle activity requires ____ glucose and oxygen to be supplied to the muscle cells.

Answer 1

INCREASE and MORE

Question 2

What happens to an unfit person when they exercise?

Answer 2

Their heart rate goes up a lot more during exercise than a fit person and they take longer to recover.

Question 3

Aside from oxygen and glucose, what is also used in respiration during exercise?

Answer 3

Glycogen

Question 4

What is glycogen?

Answer 4

A stored form of glucose.

Question 5

How is glycogen used during exercise?

Answer 5

During exercise the body needs more glucose so glycogen is converted back to glucose to provide more energy.

Question 6

What is the equation for anaerobic respiration?

Answer 6

Glucose > energy + lactic acid

Question 7

When does the body anaerobically respire?

Answer 7

When there isn’t enough oxygen for aerobic respiration.

Question 8

What are the problems with anaerobic respiration? (Give two)

Answer 8

Any two of the below:

• It is not the most efficient way to respire
• It causes muscle fatigue because of the build up of lactic acid
• It doesn’t release nearly as much energy as aerobic respiration
• Lactic acid build up is painful

Question 9

What is an oxygen debt?

Answer 9

A temporary shortage of oxygen in the body caused by exercise