Unit 10 Gaseous Exchange Long Questions
- What do you know about cellular respiration?
- What is aerobic respiration?
- Define gaseous exchange. Why oxygen is needed?
- What is breathing? How is it different from respiration?
- Describe the process of gaseous exchange in plants.
- Describe the structure and functions of human respiratory system
- Describe the mechanism of breathing
- Describe the comparison between the inspired and the expired air.
- Describe different types of respiratory disorders in man.
- Describe bad effects of smoking. Or Write two bad effects of smoking
- What do you know about Nicotine?
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When the “World No Tobacco Day” is celebrated?
Gas Exchange
Gas exchange is the process by which oxygen and carbon dioxide move between the bloodstream and the lungs. This is the primary function of the respiratory system and is essential for ensuring a constant supply of oxygen to tissues, as well as removing carbon dioxide to prevent its accumulation.
Gas exchange is the physical process by which gases move passively by diffusion across a surface. For example, this surface might be the air/water interface of a water body, the surface of a gas bubble in a liquid, a gas-permeable membrane, or a biological membrane that forms the boundary between an organism and its extracellular environment.
Diffusion only takes place with a concentration gradient. Gases will flow from a high concentration to a low concentration. A high oxygen concentration in the alveoli and low oxygen concentration in the capillaries causes oxygen to move into the capillaries. A high carbon dioxide concentration in the capillaries and low carbon dioxide concentration in the alveoli causes carbon dioxide to move into the alveoli.
Interaction with circulatory systems
In multicellular organisms therefore, specialized respiratory organs such as gills or lungs are often used to provide the additional surface area for the required rate of gas exchange with the external environment. However the distances between the gas exchanger and the deeper tissues are often too great for diffusion to meet gaseous requirements of these tissues. The gas exchangers are therefore frequently coupled to gas-distributing circulatory systems, which transport the gases evenly to all the body tissues regardless of their distance from the gas exchanger.