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## Respiration ### Types of Respiration | Type of Respiration | Oxygen needed | Breakdown of glucose | Products | |---|---|---|---| | Aerobic | Needed | Complete | Carbon dioxide and water | | Anaerobic | Not needed | Incomplete | Plant cells: Carbon dioxide and ethyl alcoholAnimal cells: Lactic...

## Respiration ### Types of Respiration | Type of Respiration | Oxygen needed | Breakdown of glucose | Products | |---|---|---|---| | Aerobic | Needed | Complete | Carbon dioxide and water | | Anaerobic | Not needed | Incomplete | Plant cells: Carbon dioxide and ethyl alcoholAnimal cells: Lactic acid | ### Aerobic Respiration - Occurs in the presence of oxygen - Used by most organisms - Produces a lot of energy ### Anaerobic Respiration - Occurs in the absence of oxygen - Happens when an organism is not getting enough oxygen - Used for short periods in organisms like yeast - Produces less energy ### Let Us Revise 1. Inhalation and exhalation of air through lungs is called **breathing**. 2. The exchange of gases between the cells of the body and the blood is called **respiration**. 3. Breakdown of food without the presence of oxygen to release energy is **anaerobic** respiration. 4. In **anaerobic** respiration, **lactic acid** is released along with energy in anaerobes. 5. During heavy exercise our muscle cells produce **lactic acid** through anaerobic respiration ### Respiration in Humans - The respiratory tract consists of **nostrils, nasal cavity, trachea, and bronchi.** - The respiratory tract and lungs together form the respiratory system in humans. - The nose helps air to enter the respiratory system. - The nasal passage is lined with mucus-secreting cells and hair, which keeps the passage moist and traps dust particles and germs, thereby preventing them from entering the respiratory tract - The air breathed in, passes from nostrils through the pharynx to the windpipe or trachea. - Trachea is a tube that connects the pharynx and larynx to the lungs, allowing the air to pass through. - It branches into two smaller tubes called **bronchi**, which