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Breathing & Exchange of Gases in One Shot (NCERT) Video Lecture | Biology Class 11 - NEET

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FAQs on Breathing & Exchange of Gases in One Shot (NCERT) Video Lecture - Biology Class 11 - NEET

1. What is the process of breathing?
Ans. Breathing is the process of inhaling oxygen-rich air into the lungs and exhaling carbon dioxide out of the body. It involves the movement of the diaphragm and intercostal muscles to expand and contract the lungs, allowing air to enter and exit.
2. How does the exchange of gases occur in the respiratory system?
Ans. The exchange of gases in the respiratory system occurs through a process called diffusion. Oxygen from the inhaled air moves from the alveoli (tiny air sacs in the lungs) into the bloodstream, where it binds with hemoglobin in red blood cells. At the same time, carbon dioxide, produced as a waste product in the body, diffuses from the blood into the alveoli to be exhaled.
3. What are the main organs involved in the process of breathing and gas exchange?
Ans. The main organs involved in the process of breathing and gas exchange are the lungs, diaphragm, trachea, bronchi, bronchioles, and alveoli. The lungs are the primary organs responsible for breathing, while the diaphragm helps in expanding and contracting the lungs. The trachea, bronchi, and bronchioles are air passages that connect the lungs to the external environment, and the alveoli are the site of gas exchange.
4. What factors affect the efficiency of gas exchange in the respiratory system?
Ans. Several factors affect the efficiency of gas exchange in the respiratory system. These include the surface area of the alveoli, the thickness of the respiratory membrane, the concentration gradient of gases, the ventilation-perfusion ratio, and the condition of the respiratory system (such as diseases like asthma or chronic obstructive pulmonary disease).
5. How does exercise affect the rate of breathing and gas exchange?
Ans. During exercise, the rate of breathing and gas exchange increases to meet the increased oxygen demand of the body. The breathing rate and depth increase to bring in more oxygen and remove carbon dioxide at a faster rate. This is facilitated by the body's increased oxygen consumption, elevated heart rate, and improved circulation, allowing for efficient gas exchange in the lungs.
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