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Questions and Answers
What is the main function of the respiratory system in advanced animals?
What is the main function of the respiratory system in advanced animals?
- To facilitate the process of diffusion
- To transport oxygen to the body cells (correct)
- To store chemical energy from the sun
- To supply nutrients to the cells
What would happen to most cells if they did not receive oxygen (O2)?
What would happen to most cells if they did not receive oxygen (O2)?
- They would multiply rapidly
- They would become anaerobic
- They would store chemical energy
- They would die (correct)
Which step of respiration involves the exchange of oxygen and carbon dioxide between the blood and the air?
Which step of respiration involves the exchange of oxygen and carbon dioxide between the blood and the air?
- Transportation
- External respiration (correct)
- Mechanical breathing
- Internal respiration
In simple multicellular organisms, how do cells exchange gases with their environment?
In simple multicellular organisms, how do cells exchange gases with their environment?
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Which step of respiration involves the movement of air into and out of the lungs?
Which step of respiration involves the movement of air into and out of the lungs?
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Study Notes
Respiratory System Functions
- Main function is to facilitate gas exchange, supplying oxygen to cells and removing carbon dioxide.
- Oxygen plays a critical role in cellular respiration, necessary for energy production.
Effects of Oxygen Deprivation
- Lack of oxygen leads to anaerobic respiration, which results in insufficient ATP production.
- Cells may resort to fermentation, leading to the accumulation of lactic acid or ethanol, potentially causing cell damage or death.
Gas Exchange Mechanism
- The exchange of oxygen and carbon dioxide between blood and air occurs in the alveoli of the lungs.
- Alveoli are tiny air sacs that increase surface area for efficient gas transfer.
Gas Exchange in Multicellular Organisms
- Simple multicellular organisms utilize diffusion for gas exchange.
- Gases diffuse directly across cell membranes from the surrounding environment, relying on a moist surface for effective transfer.
Air Movement in Respiratory System
- The movement of air into and out of the lungs is known as ventilation.
- Ventilation includes inhalation and exhalation, regulated by respiratory muscles and pressure changes in the chest cavity.
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