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Day One: Introduction
DO NOW
Directions: The President is drinking a drink from a sippy straw. Straws are amazing, because with almost no effort, the
straw can caused a liquid to defy gravity and move upwards. How do you think a straw works?
Mr. Shah’s 7th Grade Science Class | Page 1
TALK LIKE A SCIENTIST
Respiration:
I DO: Cellular Respiration
Directions: Identify the materials involved in cellular respiration. Circle the materials that are waste products of this
chemical reaction. Draw a box around the product that cells use for energy.
Mr. Shah’s 7th Grade Science Class | Page 2
WE DO: Photosynthesis vs. Respiration
Directions: Categorize characteristics of photosynthesis and cellular respiration. Put a check mark in the appropriate
column to show which process is being explained.
Process
Photosynthesis
Cellular
Respiration
1. Carbon dioxide is one of the reactants.
2. Energy in the form of ATP is released.
3. Glucose is a product.
4. This occurs within chloroplasts.
5. This process requires light energy.
6. One of the products is water.
7. Light energy is needed for this process.
8. This process takes place in mitochondria.
9. The result is a usable form of energy called ATP.
10. Oxygen must be present as a reactant.
11. Life depends on this process.
12. This occurs in plants.
13. Oxygen is released from the plant.
14. These processes are interrelated.
15. Water molecules are split apart.
16. Atoms combine to form sugar.
17. This is required for growth and tissue repair.
18. It produces most of the oxygen in the atmosphere.
Mr. Shah’s 7th Grade Science Class | Page 3
YOU DO: Inhalation and Exhalation
The human respiratory system is designed for one
purpose: to get oxygen to the cells of the body for
cellular respiration to occur. Combined with the
digestive system, which supplies the glucose, this
gives your cells everything they need to make energy
and keep you alive. This means two things:


The system must allow in oxygen
The system must keep out bad gases
The air we breathe is often filled with toxins and
unwanted gases. The respiratory is structured to
filter out all of these pollutants so that when we
breathe in, we get the gases we want, and catch and
eject the gases and airborne particles we don’t.
Directions: Answer the following questions based
on the diagram of inhalation (breathing in) and exhalation (breathing out).
1. What happens to the diaphragm when we breathe in?
2. What happens to the chest when the diaphragm contracts?
3. Why do the lungs expand when inhaling?
4. What is the importance of the ribs to this system?
The lungs serve a secondary function in humans that is not
always found in other animals – the air produced while
exhaling can be used to produce voice. This is produced in
the larynx and pharynx, which are above the trachea in the
back of the throat.
The air we inhale is about 21% oxygen, and when we
exhale, it is about 16% oxygen. The 5% loss is the air that
we send to the cells of our body through our blood.
1. Why is the heart so close to the lungs?
2. Why are there two lungs and not just one?
3. Why are there ridges on the trachea?
4. Why are there so many alveoli?
The diaphragm is a muscle in your body which can work intentionally or automatically. You can make yourself inhale
and exhale at different speeds and power levels, but your body can also regulate breathing without you thinking about
it. Think about your breathing for a moment. How does your breathing change when you are thinking about it?
Mr. Shah’s 7th Grade Science Class | Page 4
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EXIT TICKET
Directions: Complete the diagram of cellular respiration. Then, write an explanation of the process.
Mr. Shah’s 7th Grade Science Class | Page 5