Chapter 2 Lesson 2 Cellular Respiration
Cells and Heredity
7th Grade Life Science
Ms. Schreurs
My Planet Diary Going To Extremes
Page 50
What Happens During Cellular Respiration?
Energy comes from ______!!
Figure 1, page 51: How does the hiker’s energy change in these pictures?
What is Cellular Respiration? • _________________: process by
which cells obtain energy from glucose (sugar)
• Cells break down _________ and other molecules from food in the presence of oxygen, releasing _________
Storing and Releasing Energy: – When you eat a meal, you store _________
– When cells need energy they break down that glucose in cellular respiration
• Breathing and Respiration – Breathing brings ________to your lungs
– Oxygen is used in cellular respiration
What are the raw materials of photosynthesis?
The Two Stages of Cellular Respiration
• Stage 1 – Happens in the __________
– Molecules of glucose are broken down into smaller molecules
– _________ is not yet involved
– Small amount of energy is released
The Two Stages of Cellular Respiration
• Stage 2 – Happens in the
________________
– Small molecules (of glucose) are broken down even more
– Requires _________ and releases a great deal of
energy
– Cell uses the energy for all of its activities Summarize page 52
The Cellular Respiration Equation
Use the boxes below the equation to label the raw materials, and the
products.
____________ ______________
Comparing Two Energy Processes
Figure 3 page 53
Opposite Processes
Producers carry out
photosynthesis, but producers
and consumers both carry out
cellular respiration. Use the
word bank to complete the
blank boxes.
Assess Your Understanding , page 53
Fill out the stages of cellular respiration below
What Happens During Fermentation?
• ______________: Energy releasing process that does not require oxygen – Cells release energy from food without
using oxygen
– Releases ________ energy than cellular respiration
Alcoholic Fermentation
• Occurs in _________ and other single-celled organisms
• Produces alcohol, carbon dioxide, and a small amount of ____________
• Carbon dioxide produced by yeast produces pockets in bread dough causing it to rise
Lactic Acid Fermentation
• When your cells use up
oxygen faster than it can be
replaced (example: running)
• Cells then get energy by
breaking down glucose
without using __________
• Product= _____________
• Lactic acid causes pain in
muscles
Energy for Life
• How do living things get energy? Figure 4 Page 55
Assess Your Understanding
Page 55