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Cellular Respiration Do Now : Why do we need to breathe?

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Presentation on theme: "Cellular Respiration Do Now : Why do we need to breathe?"— Presentation transcript:

1 Cellular Respiration Do Now : Why do we need to breathe?

2 Equation Reactants Products Oxygen + Glucose
Carbon dioxide + Water + ATP 2 Reactants Products Energy is released when glucose is broken down. CO2 is released as a waste gas. Which side is the reactants and which side is the products?

3 2 Kinds of Cellular Respiration
Aerobic: Occurs in the presence of oxygen Anaerobic: Occurs when no oxygen is present.

4 Aerobic Respiration 3 stages Glycolysis Krebs cycle
Electron Transport Chain

5 Glycolysis First stage in cellular respiration
Only stage that does not require O2 There is no net gain or loss of C because one 6-C molc (glucose) is broken into two 3-C mole (pyruvate) for a total of 6 Carbons.

6 Requires 2ATPs to start. End Product = 4 ATP Net Gain: 2 ATP
One cell can produce thousands of ATP molecules in a few milliseconds!!! The net gain of ATP is small, but the cell can make many ATP in a very short period of time. And, because glycolysis does not require Oxygen, it can occur in anaerobic conditions.

7 REVIEW: What is the purpose of glycolysis?
To break down glucose

8 Krebs Cycle CO2 is released as a waste gas Requires O2 Occurs in
mitochondria Produces 2 ATPs

9 Electron Transport Chain
ADP is converted into ATP Up to 34 ATPs can be produced

10 Aerobic respiration yields a net total of 36-38 ATPs

11 Question: Which step of aerobic respiration produces the most ATPs (most efficient step)? ETC- Electron Transport Chain

12 Question : In what part of the cell aerobic respiration takes place? Mitochondria

13 • identify the organelle where this process occurs
AIM : Fermentation Do Now Discuss photosynthesis and explain its importance to an organism. In your answer, be sure to: • identify the organelle where this process occurs • identify two raw materials necessary for this process • identify one energy-rich molecule that is produced by this process • state how organisms use the energy-rich molecule that is produced • state how a gas produced by this process is recycled in nature

14 Fermentation Anaerobic process: occurs in absence of O2.
Recycles NAD+ ,so that glycolysis can continue producing 2ATPs for every round. Does not produce any ATP

15 2 kinds of fermentation:
Alcoholic Fermentation Lactic Acid Fermentation

16 Alcoholic Fermentation
+ 2 Ex: Yeast in Bread Bread rises due to yeast fermentation. The alcohol produced evaporates when the bread is cooked.

17 Lactic Acid Fermentation
+ Produced in muscle cells during exercise when body is no longer able to supply O2 to cells. When exercising, it is important to maintain a constant breathing rate (and not hold your breath) because your body cells are supplied at a more constant rate with oxygen. This helps to limit the amount of lactic acid produced because cells are with oxygen longer. Some bacteria also produce lactic acid as a waste product during cellular respiration. Prokaryotic organisms are used to make cheese, yogurt, buttermilk, sour cream, pickles, and sauerkraut.

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