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Respiration. Think, pair, share. The word equation for respiration. Where aerobic respiration takes place in the cell. Why do cells need energy?. Energy in Cells. Cells need energy for; Cell division, growth, muscle contraction and synthesising large molecules. - PowerPoint PPT Presentation
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Respiration
Think, pair, share
• The word equation for respiration.
• Where aerobic respiration takes place in the cell.
• Why do cells need energy?
Energy in Cells
Cells need energy for;
Cell division, growth, muscle contraction and synthesising large molecules.
Where does this energy come from?
Energy in FoodHow do you know that there is energy present in the malteser?
The Respiration Equation
Glucose + Oxygen Energy + Carbon + Water (ATP) Dioxide
From Our food
Can be used for Cell activity e.g.
Muscle contraction
Respiration
Respiration is a series of enzyme controlled reactions that releases the chemical energy stored in glucose.
ATP• The energy from glucose is used to form ATP by
making a bond between ADP (adenosine di-phosphate) and Pi (inorganic phosphate).
Energy from glucose
ATP• ATP carries the energy to a cell which needs
energy and breaks down into ADP and Pi.
Energy released from ATP
The energy released from the bond can be used in cell division, muscle contraction and making proteins.
ATP
ADP + Pi
ENERGYPUT IN
ENERGYRELEASED
RespirationOf glucose
Used forCell
Activity
The Energy Cycle
Quick Questions
1.What is respiration?
2.What is the equation for respiration?
3.What form does the energy take when it is released from food?
4. What does ATP stand for?
5. What can ATP be used for?
Aerobic Respiration
Breakdown of glucose to release energy in thepresence of oxygen is a two step process:
1. Glycolysis: Glucose is split in two becomingpyruvic acid
2. Breakdown of pyruvic acid into simple products
Using Oxygen
Stage 1: Glycolysis
Glucose Splitting
Glucose (6 carbons)
Pyruvic Acid (3 carbons)
enzymecontrolled reactions
How many molecules of pyruvic acid come from 1 molecule of glucose?
Stage 2: Breakdown of pyruvic acid
Pyruvic acid + oxygen
carbon dioxide + water
enzymecontrolled reactions
When is ATP produced?
Glucose
Pyruvic Acid
carbon dioxide + water
+ oxygen
2ADP + 2Pi
2ATP
36 ADP + 36 Pi
36 ATP
How many molecules of ATP are produced from 1 molecule of pyruvic acid?
Glucose
Pyruvic Acid
carbon dioxide + water
+ oxygen
2 ATP
36 ATP
Total = 38 ATP
ATP production
Anaerobic Respiration in Plants and Yeast
no oxygenGlucose
Pyruvic Acid
Ethanol and Carbon Dioxide
2ADP + Pi
2ATP
No ATP
Total2 ATP
Effects of Lactic Acid in Muscle
Glucose
Pyruvic Acid
Lactic acid
heavy exercise
BUILD UP OXYGEN DEBT
recovery period
OXYGEN DEBT REPAID
+ oxygen
3.5.3 Comparing aerobic and anaerobic
Aerobicrespiratio
n
Anaerobic respiration animals
Anaerobic respiration plants
Glycolysis
ATP yield
Products
Yes Yes Yes
38 2 2
Carbon dioxide& water
Lactic acid Ethanol &Carbon dioxide
Time (mins)
Force (Newtons)
0 4005 3807 39010 35018 33020 29022 30025 29026 27030 240
Produce a graph using the information below:
Explain why the force used by the muscle is decreasing.
Questions1. Define the term anaerobic respiration.2. Explain why lactic acid builds up in the
muscles.3. Identify 2 conditions necessary for the
oxygen debt to be repaid.4. Give 3 differences between the breakdown
of a glucose molecule in a root cell which respires in;
a) well aerated soil. b) anaerobically in flooded soil.