Life Science Chapter 2 Section 2 Respiration Life Science Chapter 2 Section 2

Storing and Releasing Energy Captured energy is saved as carbohydrates Sugars and starches When carbohydrates are broken down, energy is released When cells need energy they break down carbohydrates to release energy

Respiration Respiration is the process that breaks down carbohydrates to release energy This process occurs continuously Respiration has two meanings To breath To break down carbohydrates for energy Also known as cellular respiration

Respiration Equation

The Respiration Equation Raw materials: 1 glucose molecule 6 oxygen molecules Products: 6 carbon dioxide molecules 6 water molecules Energy

The Respiration Equation Plants undergo processes to produce glucose autotroph Animals obtain glucose from organisms they consume Heterotroph

Two Stages of Respiration Stage 1- Cytoplasm Glucose molecules are broken down No oxygen involved Small amount of energy is released

The Two Stages of Respiration State 2- Mitochondria Small molecules broken down farther Requires oxygen Great deal of energy is released Reason mitochondria is called the “power house”

Comparing Photosynthesis and Respiration Photosynthesis and Respiration are opposite processes Photosynthesis produces the energy and respiration releases into a useable form.

Fermentation Provides energy to cells Requires not oxygen Low amount of energy

Fermentation Alcoholic Fermentation Lactic-Acid Fermentation Yeast Alcohol is a product Other products Carbon dioxide Small amount of energy Important to Brewers and bakers When cells lack oxygen and cells need energy- lactic acid is released Occurs in athletes Painful muscles Weak and sore