Ventilation: The physical process of moving air into and out of the lungs, involving inhalation and exhalation, driven by pressure differences created by respiratory muscles.
Gas Exchange: The diffusion of oxygen from alveoli into blood and carbon dioxide from blood into alveoli, primarily occurring across the alveolar-capillary membrane.
Alveoli: Tiny, balloon-like structures in the lungs where gas exchange occurs; they provide a large surface area for efficient diffusion.
Hemoglobin: A protein in red blood cells that binds oxygen, facilitating its transport from lungs to tissues; also involved in carbon dioxide transport.
Partial Pressure: The pressure exerted by a specific gas within a mixture, influencing the direction and rate of gas diffusion between alveoli and blood.
Regulation of Breathing: The control of respiratory rate and depth by neural centers in the brainstem and chemical sensors that respond to blood gas levels.
1. What is the primary function of gas exchange in the respiratory system?
2. What is the primary function of alveoli in the respiratory system?
3. Which of the following structures connects the middle ear to the nasopharynx?
Ventilation — definition?
Movement of air into and out of lungs.
Respiratory system functions?
Ventilation, gas exchange, protection, olfaction.
Upper respiratory structures — role?
Condition, filter, and conduct air to lower respiratory tract.
Alveoli — role?
Gas exchange surface in lungs.
Gas exchange in alveoli — process?
Diffusion of oxygen into blood and CO₂ out.
Hemoglobin — function?
Binds oxygen in blood.
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