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