respiration

Question 1

cellular respiration

Answer 1

an exothermic reaction which transfers energy from glucose and is continuously occurring in living cells

Question 2

metabolism

Answer 2

all chemical processes that occur in living organisms in order to maintain life

Question 3

what is aerobic respiration?

Answer 3

occurs with enough oxygen and is the most efficient way to transfer energy from glucose. It happens continuously in plants and animals in the mitochondria

Question 4

aerobic respiration word equation

Answer 4

glucose + oxygen > carbon dioxide + water

Question 5

anaerobic respiration

Answer 5

without oxygen when it is unable to keep up with the demands of aerobic respiration

Question 6

anaerobic respiration word equation

Answer 6

glucose > lactic acid

Question 7

why do we prefer not to use anaerobic respiration?

Answer 7

-incomplete breakdown of glucose molecules
-build up of lactic acid

Question 8

why does heart rate increase during exercise?

Answer 8

the heart contracts faster and increases blood circulation resulting in oxygenated blood reaching the muscles more quickly

Question 9

what is oxygen debt?

Answer 9

anaerobic respiration occurs when there is no oxygen available so it produces an oxygen debt. the debt is equivalent to the total amount of oxygen required to oxidise the lactic acid formed from this process into carbon dioxide and water

Question 10

what happens to accumulated lactic acid in the body?

Answer 10

oxidised to carbon dioxide and water or converted to glucose, the glycogen - glycogen levels in the liver and muscles can then be restored

Question 11

examples of metabolism

Answer 11

building glucose from carbon dioxide