Biology B9 - Respiration

Write the word and symbol equation for Aerobic respiration

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What is respiration and where does it occur in cells?

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The process of Transferring Energy from Glucose which goes in every cell

Happens in mitochondria

Compare Aerobic and Anaerobic Respiration in Humans

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Aerobic : Uses oxygen

Produces CO2 + H2O

Releases lots of energy

Anaerobic: No oxygen

Produces lactic acid

Less energy released

What causes Muscle Fatigue during Exercise

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Build up of lactic acid from Anaerobic respiration

Causes muscle pain and tiredness

Explain what is meant by oxygen debt

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Extra oxygen needed after exercise to breakdown Lactic Acid into CO2 and H2O and restore the body to normal

Explain why breathing rate and heart rate increase during exercise

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To deliver more oxygen and glucose to muscles and remove more CO2

Supporting faster respiration

What is the energy released in respiration used for in cells?

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Muscle contraction

Active transport

Building large molecules ( e.g. proteins )

Describe how the human body responds to vigourous exercise

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Heart and breathing rate increases

Blood flow to muscle rises

Muscles may respire anaerobically producing lactic acid

After exercise, oxygen debt is repaid to remove lactic acid

Describe how you could investigate the effect of temperature on respiration in yeast

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Mix yeast and sugar and water in a test tube

Attach a bung and delivery tube to a gas syringe

Place in a water bath at chosen temperature

Measure CO2 produced in a set time

Repeat at different temperatures and keep sugar concentration and yeast amount constant

What type of reaction is Respiration and why

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Respiration is a EXOTHERMIC reaction because it transfers energy to the environment