9.2 The response to exercise

Question 1

What is muscle tissue made up of

Answer 1

• Protein fibres that contract when energy is transferred from respiration
• Lots of mitochondria to carry out aerobic respiration and transfer the energy needed
• Stores glucose as glycogen

Question 2

How is glycogen used in respiration

Answer 2

• Can be rapidly converted back to glucose to use during exercise

Question 3

What happens to your muscles when you start to exercise

Answer 3

• Muscles start to contract harder and faster
• More glucose and oxygen is needed for respiration
• Produce increased amounts of carbon dioxide that needs to be removed

Question 4

What changes take place to your body when your muscular activity increases during exercise

Answer 4

• heart rate increases
• breathing rate increases
• glycogen stored in the muscles in converted back to glucose

Question 5

What happens when your heart rate increases

Answer 5

• Arteries supplying blood to muscles widen
• Increase the flow of oxygenated blood to your muscles
• Increases the rate of supply of oxygen and glucose for the increased cellular respiration rate
• Increases the rate the carbon dioxide is removed from the muscles

Question 6

What happens when your breathing rate increases

Answer 6

• Breathe more deeply
• Breathe more often, bring more air into your lungs
• Rate at which oxygen is brought into your body and picked up by red blood cells increases, which is carried to your muscles
• Carbon dioxide can be removed more quickly from the blood in the lungs and breathed out

Question 7

What happens when glycogen stored in the muscles is converted back to glucose

Answer 7

• Supplies cells with the fuel they need for increased cellular respiration