B1.3.3

Question 1

When does anaerobic respiration occur

Answer 1

Anaerobic respiration occurs when your muscles need to transfer more energy than normal when they contract. Your heart and breathing rate increase to provide your cells with enough glucose and oxygen for respiration to increase. However during strenuous exercise it can’t meet that demand

Question 2

Word equation for anaerobic respiration

Answer 2

Glucose -> lactic acid

Question 3

What happen to glucose in anaerobic respiration

Answer 3

Glucose in not completely broken down meaning that less energy is produced

Question 4

What does aerobic respiration have more of

Answer 4

Aerobic respiration produces more ATP molecules per glucose molecule than anaerobic respiration. It has a greater yield as glucose is not fully broken down.

Question 5

What does the lactic acid produced cause

Answer 5

The lactic acid that is produced causes muscle crumps when it builds up in muscle cells.

Question 6

What happens when you finish exercising

Answer 6

When you have finished exercising you keep on breathing heavily and the extra oxygen reacts with the lactic acid breaking it down. The oxygen needed for this process is called oxygen debt.

Question 7

What does anaerobic respiration in microorganisms and plant cells produce and what is it called.

Answer 7

Anaerobic respiration in microorganisms and plant cells produces ethanol and CO2 instead of lactic acid. This is called fermentation.

Question 8

Fermentation chemical and word equation

Answer 8

Glucose -> ethanol + carbon dioxide
C6H12O6 -> 2C2H5OH + 2CO2

Question 9

Why is fermentation an example of anaerobic respiration

Answer 9

Because respiration occurs without oxygen