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Breathing & Exchange of Gases Practice Questions - DPP for NEET

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1. What is the process of breathing and exchange of gases?
Ans. Breathing is the process of inhaling oxygen and exhaling carbon dioxide. It involves the movement of air into and out of the lungs. Exchange of gases refers to the process of oxygen and carbon dioxide exchange between the lungs and the blood. Oxygen is transported to body tissues, while carbon dioxide is removed from the body through this process.
2. How does the respiratory system help in the exchange of gases?
Ans. The respiratory system consists of the lungs, diaphragm, and other respiratory muscles. When we inhale, the diaphragm and other muscles contract, causing the lungs to expand. This creates a negative pressure, and air rushes into the lungs. Oxygen from the inhaled air is then transferred to the bloodstream through tiny air sacs called alveoli. Carbon dioxide, a waste product, is expelled from the body during exhalation.
3. What are the main organs involved in breathing and gas exchange?
Ans. The main organs involved in breathing and gas exchange are the lungs, trachea, bronchi, and diaphragm. The lungs are the primary organs responsible for gas exchange, while the trachea and bronchi help transport air to and from the lungs. The diaphragm plays a crucial role in the process of breathing by contracting and relaxing to control the volume of the lungs.
4. How does oxygen reach body tissues from the lungs?
Ans. Oxygen is transported from the lungs to body tissues through the bloodstream. After entering the bloodstream in the lungs, oxygen binds to hemoglobin, a protein in red blood cells. Hemoglobin carries oxygen-rich blood to different parts of the body. In the capillaries, oxygen is released from hemoglobin and diffuses into body tissues to be used for cellular respiration.
5. What happens to carbon dioxide during gas exchange?
Ans. During gas exchange, carbon dioxide is transported from body tissues to the lungs to be exhaled. Carbon dioxide produced as a waste product in body tissues diffuses into the bloodstream. It is then transported back to the lungs, where it is expelled from the body during exhalation. The process of gas exchange ensures the removal of carbon dioxide, maintaining the balance of gases in the body.
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