Key Idea: Where do organisms get energy?

Chemical energy and food

Organisms get the energy they need from food

​Energy stored in food is expressed in units of calories

​

1 calories = amount of energy needed to raise 1 gram of water 1 ^oC​

​

Cells break down food gradually, capturing little bits of energy at key steps​

Key Idea: What is cellular respiration?

Cellular Respiration

Cellular respiration is the process that releases energy from food in the presence of oxygen

6O₂ + C₆H₁₂O₆ ---> 6CO₂ + 6H₂O + energy

oxygen + glucose ---> carbon dioxide + water + energy​

​

3 main steps:

Glycolysis, Krebs Cycle, and Electron Transport Chain​

Oxygen and Energy

2/3 of Cellular Respiration steps require oxygen

Aerobic - steps of cellular respiration that require oxygen

The Krebs Cycle and Electron Transport Chain

​

Anaerobic - step of cellular respiration that do not rely on oxygen

Glycolysis​

Some text here about the topic of discussion