Download SB3a

Name _____________________
SB3a. Students will be able to explain the cycling of energy through the
processes of photosynthesis and respiration.
How do animals get their energy?
Animals extract energy from the food they consume through the process of
______________________________________________
What is Cellular Respiration?
–Process in which organisms release stored energy from food.
–Formula: ________________________________________________________
–Two types of Cellular Respiration
1. Aerobic Respiration ( _________________________)
2. Anaerobic Respiration(__________________________)
Aerobic Respiration
–Occurs in the presence of oxygen
–Involves 3 steps: Glycolysis, Krebs Cycle, and Electron Transport Chain
–Complete breakdown of _______________
–Produces: ATP + carbon dioxide
–More efficient because it produces a _____________________________ of ATP
Step 1: Glycolysis
 anaerobic process _________________________________
 takes place in cytoplasm
 splits glucose into two three-carbon molecules
 produces _______ ATP molecules
Step 2: Krebs Cycle
 Krebs cycle transfers energy to an electron transport chain.
 takes place in ____________________________________
 breaks down three-carbon molecules from glycolysis
 makes a small amount of ATP
 releases ______________________
 transfers energy-carrying molecules
Step 3: Electron Transport Chain
 The electron transport chain produces a large amount of
ATP.
 takes place in inner membrane
 energy transferred to electron transport chain
Name _____________________
 oxygen enters process
 ____________ produced
 _________________ released as a waste product
The equation for the overall process is:
_________________________________________________________
Anaerobic Respiration
–Occurs in the __________________________ of oxygen
–Body is deprived of enough oxygen to maintain aerobic reactions
–Involves 2 steps: ____________________, and _________________________
–Incomplete breakdown of sugar
–Produces:
ATP + carbon dioxide + alcohol/lactic acid
–Not as efficient as aerobic respiration (produces ___________________)
Fermentation
–allows the production of a small amount of ATP without oxygen.
–Fermentation allows glycolysis to continue making ATP when oxygen is
unavailable.
–Fermentation ________________ produce ATP.
–NAD+ is recycled to glycolysis
–Lactic acid fermentation occurs in ___________________________.
•
•
glycolysis splits glucose into two pyruvate molecules
pyruvate and NADH enter fermentation
Name _____________________
•
•
energy from NADH converts pyruvate into lactic acid
NADH is changed back into NAD+
Fermentation and its products are important in several ways.
–______________________________ is similar to lactic acid fermentation.
–glycolysis splits glucose and the products enter fermentation
–energy from NADH is used to split pyruvate into an alcohol and carbon dioxide
–NADH is changed back into NAD+
–NAD+ is recycled to glycolysis
Alcoholic Fermentation is used in food production by yeast and
microorganisms to produce:
Lactic Acid Fermentation occurs in animals.
It is caused by the buildup of lactic acids in muscle cells.
-soreness
-__________________________
Summarizer
1. What is the total amount of ATP produced from one molecule of glucose
during aerobic respiration?
2. How can you tell if your body is going through aerobic or anaerobic respiration
when you are working out?
3. Complete the chart aerobic respiration chart.
4. Complete the anaerobic respiration chart.
5. How is energy cycled through the processes of photosynthesis and
respiration?