B9 - Respiration 1️⃣✅

Question 1

What is the equation for aerobic respiration?

Answer 1

glucose + oxygen —-> carbon dioxide + water

Question 2

What is the chemical sybmbol for glucose?

Answer 2

Question 3

What is the chemical equation for Anaerobic respiration in muscles?

Answer 3

glucose —-> lactic acid

Question 4

What is the chemical equation for Anaerobic respiration in plant & yeast cells?

Answer 4

glucose —-> ethanol + carbon dioxide

Question 5

What is anaerobic respiration in yeast cells called?

Answer 5

Fermentation

Question 6

What respiring method requires oxygen?

Answer 6

Aerobic respiration

Question 7

What respiring method does not require oxygen?

Answer 7

Anaerobic respiration

Question 8

What is an oxygen debt?

Answer 8

The amount of extra oxygen the body needs after exercise to react with the accumulated lactic acid and remove it from body cells

Question 9

Where does aerobic respiration take place?

Answer 9

the mitochondira

Question 10

What type of reaction is respiration?

Answer 10

exothermic

Question 11

When do we result to respiring anerobically?

Answer 11

When we cant supply enough oxygen to our muscles because our heart & lungs are already at their maximum rate.

Question 12

Why can you only respire anerobically for a short period of time?

Answer 12

Because anerobic respiration produces lactic acid, a substance that is toxic. Hence the gasp for oxygen to rid it out of our system and turn it back into glucose to be easily expelled through the mouth/ lungs

Question 13

Where does anerobic respiration take place?

Answer 13

cytoplasm

Question 14

How is lactic acid broken down?

Answer 14

• the oxygen from the oxygen debt travels from the lungs to the liver
• the lactic acid from the respiring muscles travels in the blood to the liver
• the 02 is then used to fully oxidise the lactic acid (break it down) into glucose

Question 15

Why does lactic acid build up during anerobic respiration?

Answer 15

Because there is not enough oxygen avainable to fully oxidise glucose

Question 16

What is metabolism?

Answer 16

The sum of all the reactions in a cell or the body

Question 17

Why is fermentation of yeast cells so important?

Answer 17

Because the products of fermentation are important in the manufacturing of bread and alcoholic drinks

Question 18

Give some examples for what the energy generated by respiration is used for throughout the body

Answer 18

• chemical reactions e.g. protein synthesis
• muscle contraction & movement
• keeping warm

Question 19

Give some examples of what metabolism involves

Answer 19

• the break down & synthesis of carbohydrates from sugars e.g. starch, cellulose
• the break down & synthesis of amino acids from glucose & nitrate ions to form proteins
• the break down & synthesis of lipids from one molocule of glycerol & one molocule of fatty acids

Question 20

What is the balanced symbol equation for aerobic respiration?

Answer 20

( glucose + oxygen –> carbon dioxide + water)

Question 21

What is the balanced symbol equation for anerobic respiration?

Answer 21

( glucose —> lactic acid)