Excercise

Question 1

What are the physical effects of exercise?

Answer 1

• increases your breathing rate and makes you breathe more deeply to meet the demand for extra oxygen
• increases the speed at which your heart pumps

Question 2

What is glucose from food stored as?

Answer 2

Glycogen

Question 3

Name the two places glycogen is stored

Answer 3

It’s main store is in the liver. Each muscle has its own store of glycogen

Question 4

How is glycogen used during vigorous exercise?

Answer 4

Muscles are rapidly using glucose and so some stored glycogen is converted back to glucose to provide more energy

Question 5

When do we use anaerobic respiration?

Answer 5

When the body cannot supply enough oxygen to your muscles

Question 6

What does anaerobic mean?

Answer 6

Without oxygen

Question 7

What is the equation for anaerobic respiration?

Answer 7

Glucose -> energy + lactic acid

Question 8

How is lactic acid produced?

Answer 8

The incomplete breakdown of glucose

Question 9

What are the negative effects of anaerobic respiration?

Answer 9

• a build up of lactic acid is painful
• causes muscle fatigue, so the muscles get tired and stop contracting efficiently
• does not release as much energy as aerobic respiration

Question 10

Name an advantage of anaerobic respiration

Answer 10

You can keep using your muscles for a little while longer

Question 11

Why does the blood flow at a faster rate when you exercise?

Answer 11

When you exercise, your muscle activity increases, and so more glucose and oxygen needs to be supplied to the muscle cells. A faster blood flow means that the extra carbon dioxide can be removed from the muscle cells