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Role of Carbon dioxide During Respiration Video Lecture | Science Class 7 (Old NCERT)
FAQs on Role of Carbon dioxide During Respiration Video Lecture - Science Class 7 (Old NCERT)
| 1. What is the role of carbon dioxide during respiration? |  |
Ans. Carbon dioxide plays a crucial role in respiration. During respiration, carbon dioxide is produced as a waste product when cells break down glucose to release energy. This carbon dioxide is then transported in the blood to the lungs, where it is exhaled out of the body.
| 2. How does carbon dioxide affect the respiratory system? | |
Ans. Carbon dioxide is a respiratory stimulant, meaning it regulates the breathing rate. When carbon dioxide levels in the blood increase, it triggers the respiratory center in the brain to increase the rate and depth of breathing. This helps to remove excess carbon dioxide from the body and maintain a balance of gases in the blood.
| 3. Can carbon dioxide be harmful to the body during respiration? | |
Ans. While carbon dioxide is a waste product of respiration, excessive levels of carbon dioxide in the body can be harmful. High levels of carbon dioxide can lead to a condition called hypercapnia, which can cause symptoms like dizziness, confusion, shortness of breath, and even loss of consciousness. However, the body has mechanisms in place to regulate carbon dioxide levels and prevent such harmful effects.
| 4. How is carbon dioxide transported in the body during respiration? | |
Ans. Carbon dioxide is transported in the body in three main ways: dissolved in plasma, bound to hemoglobin, and as bicarbonate ions. When carbon dioxide is produced in the cells, it diffuses into the bloodstream and combines with water to form carbonic acid. This carbonic acid then dissociates into bicarbonate ions and hydrogen ions. Bicarbonate ions are transported in the plasma, while some carbon dioxide binds to hemoglobin for transport.
| 5. What happens to carbon dioxide in the lungs during respiration? | |
Ans. In the lungs, carbon dioxide is exchanged for oxygen through the process of respiration. When we breathe in, oxygen enters the bloodstream, and carbon dioxide exits the bloodstream to be exhaled out of the body. This exchange occurs in the alveoli, tiny air sacs in the lungs, where oxygen is taken up by red blood cells, and carbon dioxide is released into the air sacs to be exhaled.
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