Respiration
Read the questions and then set them aside. Read the first paragraph of
p 340 How Cells convert Food to Energy. Then write the answers in your own
words in your science notebooks in complete sentence form. Do not use “it”
or “they” as subjects.
1. What is breathing?
Inhaling oxygen and exhaling carbon dioxide
2. Which organisms breathe?
Animals
3. Which organisms use cellular respiration?
All living organisms
4. What is cellular respiration?
The process that cells use to break down fuels (glucose) to yield energy
for cells to function
5. What would happen without cellular respiration?
Processes critical to life would stop. DEATH!
6. Go to page 343. Write down the chemical formula for the respiration
reaction. Compare and contrast this formula with the formula for
photosynthesis.
C6H12O6 + 6O2  6CO2 + 6H2O + ATP
Glucose + oxygen  carbon dioxide + water + energy
*Both contain the same “players” (sugar, oxygen, carbon dioxide, water,
energy)
**Respiration is backward from photosynthesis, energy source is Sunlight
vs. ATP
Read the questions and then set them aside. Read p 344 ATP: The Fuel for
Cells. Then write the answers in your own words in your science notebooks in
complete sentence form. Do not use “it” or “they” as subjects.
7. Which organisms use the molecule ATP?
All living organisms
8. FLASHBACK! What is ATP?
Adenosine triphosphate – form of chemical energy used in cells
9. What specific things can ATP provide?
Energy to actively transport ions across membranes, to trigger muscle
contractions, to send nerve impulses, and for biosynthesis
10. What is biosynthesis? (Just guess: Bio = _ Synthesis=_)
MAKE molecules necessary for LIFE! Form larger molecules from small
molecules (example: starch from glucose, or proteins from amino acids)
11. ATP is referred to as what?
Energy currency for cells
12. If the energy stored in food is like stocks then ATP is like _. (Write this
as a complete sentence.)
Cash (that is readily available)
Read the questions and then set them aside. Read p 345 Respiration During
Exercise. Then write the answers in your own words in your science
notebooks in complete sentence form. Do not use “it” or “they” as subjects.
13. What happens when you exercise?
Cells respond by increasing the rate of cellular respiration
14. What happens when carbon dioxide levels in your blood rise?
Breathing rate increases to rid body of CO2 and deliver O2 to
bloodstream
15. Why does your body switch from aerobic respiration to anaerobic
respiration?
When muscle cells require more O2 than the blood can deliver
16. What do a lot of people think causes the burn in your muscles during hard
exercise?
Lactic acid
17. What ion do scientists now know causes the burning during intense
exercise?
H+ - Hydrogen ions
18. Which respiration is more efficient? By how many ATPs?
Aerobic respiration – 19 times the amount of ATP
19. What are two differences in a couch potato’s physiology and a
conditioned athlete?
Conditioned person’s cells have more mitochondria and improved blood
circulation