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Questions and Answers
What is the physiological definition of respiration?
What is the physiological definition of respiration?
- Movement of oxygen from the outside environment to the cells within tissues (correct)
- Contraction of the diaphragm muscle
- Metabolic process by which an organism obtains energy
- Circulation of blood in the pulmonary capillaries
What is the biochemical definition of respiration?
What is the biochemical definition of respiration?
- Movement of oxygen from the outside environment to the cells within tissues
- Metabolic process by which an organism obtains energy (correct)
- Contraction of the diaphragm muscle
- Circulation of blood in the pulmonary capillaries
What is the role of ventilation in gas exchange in the lung?
What is the role of ventilation in gas exchange in the lung?
- In and out movement of air in the lungs (correct)
- Contraction of the diaphragm muscle
- Gas exchange between air in the alveoli and the blood
- Circulation of blood in the pulmonary capillaries
What is the function of perfusion in physiological respiration?
What is the function of perfusion in physiological respiration?
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What causes the pressure variation during inhalation?
What causes the pressure variation during inhalation?
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Study Notes
Respiration Definitions
- Physiological definition: The process of exchanging oxygen and carbon dioxide between the environment and the body's cells.
- Biochemical definition: The process of generating energy from the breakdown of glucose and other organic molecules, releasing carbon dioxide and water as byproducts.
Ventilation and Perfusion
- Ventilation: The process of moving air in and out of the lungs, facilitating gas exchange between the atmosphere and the alveoli.
- Perfusion: The process of blood flowing through the lungs, allowing for the exchange of oxygen and carbon dioxide between the air and the bloodstream.
Pressure Variations during Inhalation
- During inhalation, the pressure in the thoracic cavity decreases, causing the lungs to expand and air to enter the lungs.
- This pressure variation is caused by the contraction of the diaphragm and the intercostal muscles, which increases the volume of the thoracic cavity.
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