Directions: Use the information provided and your knowledge of Life Science to answer the following questions. Show all work where necessary.
Directions: Use the information provided and your knowledge of Life Science to answer the following questions. Show all work where necessary.
When an athlete begins running, cycling, or swimming at a steady pace, the body rapidly increases its use of aerobic cellular respiration. This process takes place inside mitochondria and involves breaking chemical bonds in glucose and oxygen molecules to form new bonds in carbon dioxide and water. The rearrangement of these atoms releases usable energy in the form of ATP. This flow of energy is essential for continuous muscle contractions during endurance activities.
During aerobic respiration, the six-carbon glucose molecule enters pathways such as glycolysis and the citric acid cycle. Enzymes break C–H and C–C bonds, releasing electrons that transfer energy to carrier molecules (NADH and FADH). These electrons then move through the electron transport chain, where oxygen acts as the final electron acceptor. When oxygen binds with electrons and hydrogen ions, new O–H bonds form, creating water. This bond formation is tightly linked to ATP production.
As exercise intensity increases, muscle cells require more ATP per minute. To keep up with this demand, athletes breathe faster and deeper, bringing in more oxygen. Heart rate also rises to deliver oxygen more efficiently to the muscles. The more oxygen absorbed and delivered, the more glucose can be oxidized, and the more ATP is produced. This is why oxygen consumption (
The chemical transformations occurring during aerobic respiration also produce carbon dioxide. As more glucose molecules are broken down, more
Athletes with high aerobic fitness levels - such as marathon runners - have greater mitochondrial density, stronger cardiac output, and higher
Diagram 1.
Source:
utori.com/en/story/cellular-respiration--6WvJyqXruTC2CceDaqoTWNga
Table 1.
Exercise Intensity (% max) | Oxygen Consumption (mL/kg/min) | ATP Production (mmol ATP/min) |
|---|---|---|
20 | 12 | 8 |
40 | 22 | 15 |
60 | 32 | 23 |
80 | 45 | 32 |
100 | 60 | 40 |
Graph of Information - Figure 1.
Table 2.
Time (minutes) | Glucose Used (g) | CO2 Produced (g) |
|---|---|---|
0 | 0 | 0 |
10 | 4.2 | 6.1 |
20 | 8.5 | 12.4 |
30 | 12.3 | 18.5 |
40 | 16.8 | 24.7 |
Graph of Information - Figure 2.
Using Table 1 and Figure 1, describe how ATP production changes as exercise intensity increases from 20% to 100% of maximum.
Using the reading and Figure 1, explain how the circulatory and respiratory systems work together with muscle cells to support aerobic respiration during endurance exercise.
According to Table 1, at which exercise intensity does oxygen consumption first reach 45 mL/kg/min?
Using Table 2 and Figure 2, describe the relationship between glucose use and
Based on the reading, which statement BEST explains why carbon dioxide production increases as exercise intensity rises?
Explain how aerobic respiration breaks and forms chemical bonds to release energy needed for endurance exercise.
Claim:
Evidence:
Reasoning: