MEGA
Energy in Biology
Cellular respiration is a chemical process in which the bonds between atoms of food molecules and oxygen molecul…
Item EB075002: A person’s breathing rate increases during exercise to replenish the oxygen used in the chemical reaction that releases energy for exercise (cellular respiration) and to remove the carbon dioxide produced.
Why does a person’s breathing rate increase during exercise?
- During exercise, oxygen is converted into energy needed to move. This results in a decrease in the amount of oxygen in muscle cells. In order to continue exercising, the person needs to increase the amount of oxygen in the muscle cells. Increasing the breathing rate helps this to happen.
- During exercise, the reaction between glucose and oxygen in muscle cells releases energy used for movement. This results in a decrease in the amount of oxygen and an increase in the amount of carbon dioxide in the muscle cells. In order to continue exercising, the person needs to decrease the amount of carbon dioxide and increase the amount of oxygen in muscle cells. Increasing the breathing rate helps this to happen.
- During exercise, the reaction between glucose and oxygen in muscle cells releases energy used for movement. This results in an increase in the amount of oxygen and a decrease in the amount of carbon dioxide in the muscle cells. In order to continue exercising, the person needs to decrease the amount of oxygen and increase the amount of carbon dioxide in muscle cells. Increasing the breathing rate helps this to happen.
- During exercise, a persons’ breathing rate increases because the faster a person breathes the faster they can move their bodies. Breathing rate is not affected by chemical reactions that occur in the body.
- Distribution of Responses
- Points Earned
| Group | Correct | Total | Percent |
|---|---|---|---|
| Overall | 41 | 136 | 30% |
| Grades | |||
| 6–8 | N/A | N/A | N/A |
| 9–12 | 37 | 121 | 31% |
| Gender | |||
| Male | 15 | 74 | 20% |
| Female | 21 | 45 | 47% |
| Primary Language | |||
| English | 38 | 117 | 32% |
| Other | 0 | 8 | 0% |
- Distribution of Responses
- Points Earned
| Group | Correct | Total | Percent |
|---|---|---|---|
| Overall | 71 | 149 | 48% |
| Grades | |||
| 6–8 | N/A | N/A | N/A |
| 9–12 | 58 | 130 | 45% |
| Gender | |||
| Male | 38 | 76 | 50% |
| Female | 25 | 54 | 46% |
| Primary Language | |||
| English | 56 | 124 | 45% |
| Other | 2 | 5 | 40% |
- Disciplinary Core Ideas
- PS3.D Cellular respiration in plants and animals involve chemical reactions with oxygen that release stored energy. In these processes, complex molecules containing carbon react with oxygen to produce carbon dioxide and other materials.
LS1.A Feedback mechanisms maintain a living system's internal conditions within certain limits and mediate behaviors, allowing it to remain alive and functional even as external conditions change within some range. Feedback mechanisms can encourage (through positive feedback) or discourage (negative feedback) what is going on inside the living system.
LS1.C As a result of these chemical reactions, energy is transferred from one system of interacting molecules to another. Cellular respiration is a chemical process in which the bonds of food molecules and oxygen molecules are broken and new compounds are formed that can transport energy to muscles. Cellular respiration also releases the energy needed to maintain body temperature despite ongoing energy transfer to the surrounding environment.