6.1-6.3 Flashcards
Where does most ecosystems’ energy come from?
The sun
What are the products and reactants of cellular respiration?
Reactants: Glucose and O2. Products: CO2 and H2O. Sun energy is formed in ATP.
Where does cellular respiration take place?
Mitochondria in eukaryotic cells (all types, animals, plants, fungus and protists). Prokaryotes may have similar structures.
How are photosynthesis and cellular respiration related?
They are inverse reactions, with the exception of the sun as energy in photosynthesis and ATP as energy in cellular respiration.
Do plant cells perform cellular respiration?
YES, plants cells have chloroplasts AND mitochondria
A lot of energy in CR and photosynthesis is released….
as heat
What are the two definitions of respiration?
1: Breathing. The exchange of gases (O2 for CO2).
2: Cellular Respiration. Aerobic harvesting of energy from food molecules by cells.
Aerobic meaning?
Oxygen-requiring
A woman is running. How are the processes of breathing and cellular respiration related?
Her lungs take up O2. O2 goes to muscle cells, where mitochondria use it to make ATP. ATP helps muscle contractions to keep her running. Her bloodstream and lungs dispose CO2 that was produced in cellular respiration.
How is your breathing related to cellular respiration?
In breathing, CO2 and O2 are exchanged between your lungs and the air. In cellular respiration cells use the O2 obtained through breathing to break down fuel, releasing CO2.
What is the precise cellular respiration reaction?
Glucose (C6H12O6) + 6O2 –> 6CO2 + 6H2O + ATP + heat (THIS IS VERY SIMPLIFIED)
Is cellular respiration exergonic or endergonic?
CO2 and H2O are exergonic
how many ATP molecules per glucose molecule? How much of their energy is converted?
- 34%. VERY efficient. Everything else released as heat.
If cellular respiration were not to happen, how much ATP would be used in a body per day?
Body weight.
Why are sweating and other body-cooling mechanisms necessary during vigorous exercise?
The demand for ATP is supported by an increased rate of cellular respiration, but about 66% of the energy released from food produces heat instead of ATP.
