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Transcript of Do Now – On paper to turn in (Q & A) 1. What gas do you inhale? Exhale? 2. What transports oxygen...
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Do Now – On paper to turn in (Q & A)
• 1. What gas do you inhale? Exhale?• 2. What transports oxygen to your cells?• 3. Why do your cells need oxygen?• 4. What molecule acts as energy for your
cells? What process produces this molecule?
• 5. What cells in your body might need to do more cellular respiration than others?
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LAB: Exercise and Respiration
• PS: What is the effect of…• Hypothesis: In an “If…,then…” statement• Procedures: Briefly describe your
experiment• Variables: Identify IV, DV, control,
constants• Data: Record your data in a table
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Individual assignment
• GRAPH your data• Write a CONCLUSION in C – E – R
format.– CLAIM: What did your experiment show?– EVIDENCE: Describe your data/– REASONING: Give a SCIENTIFIC
EXPLANATION for your results. Think about WHY cells would produce more carbon dioxide?
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Cellular Respiration
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ATP-ADP cycle
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Food is energy
• Food is chemical energy • Photosynthesis stores radiant energy
from the sun in the bonds in organic molecules.
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Releasing chemical energy
• Cellular respiration – chemical reaction that uses oxygen to convert chemical energy in organic molecules into adenosine triphosphate (ATP)
• About 40% of food consumed is used
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ATP!
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ATP stores energy
• ATP – adenosine triphosphate– 1 adenine (nitrogen containing compound)– 1 sugar– 1 3-phosphate tail (ENERGY!)
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The triphosphate tail• The triphosphate in
ATP stores the energy
• Each phosphate is negative; repulsion stores PE
• When phosphate bond is broken, PE is released
What are you left with?
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The ATP cycle• When ATP loses a
phosphate it becomes ADP
• ADP is recyclable• Adding a phosphate
(phosphorylation) to ADP requires energy
• where do we get this energy from?
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Cellular Respiration
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C6H12O6 + 6O2 6CO2 + 6H2O + 36ATP
Glucose + oxygen carbon + water + cell dioxide
energy
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Structure of the mitochondria
• Site of majority of respiration
• Highly folded to increase surface area
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Cellular Respiration contains 3 steps
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Step 1: Glycolysis
• Requires 2 ATP to split 1 glucose creating 2 pyruvic acid molecules
• Creates 4 ATPs
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Glycolysis Summary
• _______ ATP are used to produce _______ ATP, for a net gain of ______ ATPs
• 1 molecule of glucose has been converted into 2 molecules of ________________
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Step 2: The Krebs Cycle
• Pyruvic acid diffuses into the mitochondria matrix
• Before the Krebs cycle PA is converted into acetyl CoA– By loss of a CO2
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Step 2: The Krebs Cycle
• Acetyl CoA joins oxaloacetate creating citric acid
• CO2 is released • 1 ATP produced• Forms several NADHs
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Step 2: The Krebs Cycle
• oxaloacetate is left over and grabs the other pyruvic acid and does it again
• NADHs continue to step 3
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The Krebs Cycle Summary
• Glucose molecule has been completely broken down
• ______ gas and _________ ATP are produced– ______ ATP per turn
• NADHs have been created storing ___________
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Step 3: Electron Transport
• NADH transfers electrons to electron transport chain in the inner membrane
• Electrons move from carrier to carrier, eventually being pulled to the electron grabber, OXYGEN– The oxygen, electrons, and H+ ions bond to
make water (a product)
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Step 3: Electron Transport
• Each transfer of electrons releases energy that is used to make ATP
• This energy is used to make 32 ATP!
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Adding it all up!
• For every glucose molecule, your cells make up to ________ ATP!
• Glycolysis is the only step that does not require oxygen
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ATP without oxygen?
• What happens if you cannot take in oxygen fast enough to meet your ATP demand?
ACTIVITY: Create a two-column chart comparing cellular respiration and fermentation