Lesson Overview
Cellular Respiration: An Overview
THINK ABOUT IT
You feel weak when you are
hungry because food
serves as a source of
energy. How does the food
you eat get converted into a
usable form of energy for
your cells?
Lesson Overview
Cellular Respiration: An Overview
Lesson Overview
9.1 Cellular Respiration:
An Overview
Lesson Overview
Cellular Respiration: An Overview
Learning Outcomes
• Explain energy release from food for cellular
activities.
• Show relationship between photosynthesis and
cellular respiration with regard to reactants and
products.
• Review the role of ATP.
• Determine rate of cellular respiration by measuring
amount of Carbon dioxide produced.
Lesson Overview
Cellular Respiration: An Overview
Engage: Do Now Activity
Define the following rates:
1. Cellular respiration
2. Photosynthesis
3. Energy
4. ATP
5. Reactants
6. Products
7. Food
8. Light Energy
Lesson Overview
Cellular Respiration: An Overview
Motivate: Engage with Video
Photosynthesis and Cellular Respiration Video
Overview
• http://www.youtube.com/watch?v=eo5XndJazY&list=PLDHYk18tSFyQHSj8QNUj6j9iyryQy67sm
Lesson Overview
Cellular Respiration: An Overview
Chemical Energy and Food
• Organisms get the energy they
need from food.
Lesson Overview
Cellular Respiration: An Overview
Chemical Energy and Food
•
Food molecules contain
chemical energy that is released
when its chemical bonds are
broken.
Lesson Overview
Cellular Respiration: An Overview
Summary of Cellular Respiration
• What is cellular respiration?
• Cellular respiration is the process that
releases energy from food in the presence
of oxygen.
Lesson Overview
Cellular Respiration: An Overview
Overview of cellular respiration
The process of cellular respiration
Lesson Overview
Cellular Respiration: An Overview
Overview of Cellular Respiration
If oxygen is available, organisms can obtain energy from food by
a process called cellular respiration.
• The summary of cellular respiration is presented below.
In symbols:
6 O2 + C6H12O6  6 CO2 + 6 H2O + Energy
In words:
Oxygen + Glucose  Carbon dioxide + Water + Energy
Lesson Overview
Cellular Respiration: An Overview
Assess: Check Point A
1. Identify the reactants and products of cellular
respiration.
2. Explain how photosynthesis and cellular respiration
are related?
Lesson Overview
Cellular Respiration: An Overview
Determining rate of cellular respiration Activity
• Lab activity to investigate how carbon dioxide
production, heart beat and breath rate
determine rate of cellular respiration.
• Formulate hypothesis.
• Review demonstration with the teacher.
• Observe Lab Safety procedures.
• Follow experiment procedures.
Lesson Overview
Cellular Respiration: An Overview
Chemical Energy and Food
Energy stored in food is expressed in units of calories.
• A Calorie is the amount of energy needed to
raise the temperature of 1 gram of water by 1
degree Celsius. 1000 calories = 1 kilocalorie, or
Calorie.
• Cells break down food molecules gradually
and use the energy stored in the chemical
bonds to produce compounds such as ATP that
power the activities of the cell.
Lesson Overview
Cellular Respiration: An Overview
Stages of Cellular Respiration
The three main stages of
cellular respiration are:
1. glycolysis,
2. the Krebs cycle, and
3. the electron transport
chain ( ETC).
Lesson Overview
Cellular Respiration: An Overview
Stages of Cellular Respiration
Glycolysis
• produces only a small
amount of energy. Most
of glucose’s energy
(90%) remains locked in
the chemical bonds of
pyruvic acid at the end of
glycolysis.
Lesson Overview
Cellular Respiration: An Overview
Stages of Cellular Respiration
Krebs cycle
• a little more energy
is generated from
pyruvic acid.
Lesson Overview
Cellular Respiration: An Overview
Stages of Cellular Respiration
The electron
transport chain
produces the bulk of
the energy in cellular
respiration by using
oxygen, a powerful
electron acceptor.
Lesson Overview
Cellular Respiration: An Overview
Oxygen and Energy
Pathways of cellular
respiration that require
oxygen are called
aerobic.
• The Krebs cycle and
electron transport chain
are both aerobic
processes.
• Both processes take
place inside the
mitochondria.
•
Lesson Overview
Cellular Respiration: An Overview
Oxygen and Energy
Glycolysis is an
anaerobic process.
• It does not directly require
oxygen, nor does it rely on
an oxygen-requiring process
to run.
• However, it is still
considered part of cellular
respiration.
• Glycolysis takes place in
the cytoplasm of a cell.
•
Lesson Overview
Cellular Respiration: An Overview
Comparing Photosynthesis and
Cellular Respiration
• What is the relationship between photosynthesis
and cellular respiration?
• Photosynthesis removes carbon dioxide from the
atmosphere, and cellular respiration puts it back.
Photosynthesis releases oxygen into the atmosphere,
and
• cellular respiration uses that oxygen to release
energy from food, and Carbon dioxide is given off.
Lesson Overview
Cellular Respiration: An Overview
Comparing Photosynthesis and Cellular
Respiration
• Photosynthesis and cellular
respiration are opposite
processes.
• The energy flows in opposite
directions.
• Photosynthesis “deposits”
energy, and cellular respiration
“withdraws” energy.
• The reactants of cellular
respiration are the products of
photosynthesis and vice versa.
Lesson Overview
Cellular Respiration: An Overview
Comparing Photosynthesis and Cellular
Respiration
• The release of energy by
cellular respiration takes
place in plants, animals,
fungi, protists, and most
bacteria.
• Energy capture by
photosynthesis occurs
only in plants, algae, and
some bacteria.
Lesson Overview
Cellular Respiration: An Overview
Assessment
Complete online tasks on sections 9-1 to 9-3
Lesson Overview
Cellular Respiration: An Overview
Cellular Respiration Reactions
Stages