Transcript Energy Pathways and Anaerobic Metabolism

Numbered Heads Together
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How does the process of PSN and
Cellular Respiration compare? How are
they related?
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Equation for Photosynthesis:
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6CO2 + 6H2O + Light Energy  C6H12O6 + 6O2
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Equation for Cellular Respiration:
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C6H12O6 + 6O2  6CO2 + 6H2O + ATP (Chemical Energy)
Think-Pair-Share
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How would a drop in temperature most likely affect the processes of
cellular respiration and photosynthesis?
A) The rates of both cellular respiration and photosynthesis would decrease.
B) The rates of both cellular respiration and photosynthesis would remain
constant.
C) The rate of photosynthesis would increase, and the rate of cellular respiration
would decrease.
D) The rate of photosynthesis would decrease, and the rate of cellular
respiration would increase.
Think-Pair-Share
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Which of these best explains the difference between the way animals
and plants exchange gases with their environments?
A) Animals use only photosynthesis, while plants use both photosynthesis and
respiration.
B) Animals use only respiration, while plants use both photosynthesis and
respiration.
C) Animals use both photosynthesis and respiration, while plants use only
respiration.
D) Animals use both photosynthesis and respiration, while plants use only
photosynthesis.
Energy Pathways
EQ: How does your body meet the energy demands of
various physical activities?
Factors that determine which pathway your
body takes…
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Intensity (effort)
Duration
http://hypoxiagym.com/
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Anaerobic Metabolism
 ATP-CP a.k.a. Phosphogen pathway
 Fueled by stored ATP (2-3 sec)
and ATP made by creatinephosphate (6-8 sec)
 Short and intense activity
 Anaerobic Glycolysis a.k.a. Lactic Acid
System
 Fueled by carbs (sugars)
 Moderate and intense activity
 Up to 3min worth of ATP
The Energy Pathways Continued...
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Aerobic Metabolism
 Aerobic Cellular Respiration
 Fueled by carbs, fats, and proteins
 Prolonged, low intensity exercise
 Almost unlimited ability to produce
ATP…almost.
www.Crossfit.com
Think Pair Share
Energy Pathway Recruitment
Once your cells’ ATP stores are empty,
your body comes to a fork in the road…
Glycolysis
2 Pyruvate
O2 absent
Lactic Acid
System
O2 present
Krebs Cycle (Citric Acid)
Electron Transport Chain
Lactic Acid System
(p. 224-225)
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What are the effects
of intense or
prolonged exercise?
Converts pyruvate into lactic acid.
 Very Fast, no additional ATP is produced.
Muscle Fatigue
 (calcium leaks)
Pain a.k.a. “the Burn”
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H+ levels increase…becomes more acidic.
Irritates free nerve endings causing pain.
Alcoholic Fermentation
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Converts pyruvic acid (pyruvate) into
CO2 and Ethanol.
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No additional ATP are produced.
Carried out by Yeast and some bacteria.
Has many uses:
How do the processes compare?
Hmmm…
Think-Pair-Share: Why do you suppose you
continue to breath heavily after intense
physical activity?