Cellular Respiration

LN #11

Cell Biology1g. the role of the mitochondria in making stored chemical-bond energy

available to cells by completing the breakdown of glucose to carbon dioxide.

Energy Flow

• The energy needed for life to exist comes from the sun.

• Before the sun’s energy can be used by cells it needs to be turned into ATP.

Sun light to ATP

• Light energy is captured by the chloroplast.

• Photosynthesis converts the light energy into glucose (sugar).

• Glucose is broken down into ATP in a process called cellular respiration.

Cellular respiration

• The formula for cellular respiration is– C6H12O6 + 6O2 → 6CO2 + 6H2O + ATP

• Cellular respiration takes place in the cytoplasm and mitochondria of cells.

• Cellular respiration produces 38 ATP molecules for every glucose molecule.

The 3 parts of cellular respiration

• The first part is called glycolysis and it occurs in the cytoplasm.

• The second and third part are called the Krebs cycle and Electron transport chain they both occur in the mitochondria.

Cellular Respiration & Muscles

• In order for cellular respiration to take place oxygen is needed.

• Oxygen is delivered to cells by breathing.

• Carbon dioxide is a waste product of cellular respiration.

• You remove carbon dioxide from your body by breathing.

When there is no Oxygen

• There are times when your cells run out of oxygen, like during difficult exercise.

• Your cells still need a way to get energy.• Lactic acid fermentation supplies energy when

oxygen is low.

Lactic Acid Fermentation

• Lactic acid fermentation gives you 2 ATPs for every glucose.– Cellular respiration gives

38 ATPs

• Lactate is the waste product of lactic acid fermentation.

• The collection of lactate is the cause of muscle soreness.

Summary

• What needs to happen to light energy before your cells can use it?

• What organelle captures the energy from the sun?

• What is cellular respiration?• Where does cellular respiration take

place?• What is lactic acid fermentation? When

does it occur?

CytoplasmMitochondria