Cellular Respiration LN 11 Cell Biology 1 g

Cellular Respiration LN #11 Cell Biology 1 g. 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 – C 6 H 12 O 6 + 6 O 2 → 6 CO 2 + 6 H 2 O + 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?

Cytoplasm Mitochondria