Which structure is the primary site of gas exchange in the human respiratory system?, Alveoli, Bronchi, Pharynx, Trachea, What muscle plays the most important role in inhalation?, Pectoral muscles, Diaphragm, Abdominal muscles, Intercostal muscles, Which of the following best describes the function of the trachea?, Transport of air to the lungs, Gas exchange, Filtering blood, Production of sound, During exhalation, what happens to the diaphragm?, It contracts and moves downward, It expands outward, It relaxes and moves upward, It stiffens and remains flat, Which gas is primarily transported from tissues to the lungs for removal?, Carbon dioxide, Oxygen, Nitrogen, Helium, What structure prevents food from entering the trachea during swallowing?, Pharynx, Larynx, Epiglottis, Bronchi, Which of the following correctly describes external respiration?, Exchange of gases between alveoli and blood, Exchange of gases between blood and tissues, Cellular use of oxygen for energy, Transport of gases in the bloodstream, Which scientific principle explains why oxygen diffuses from alveoli into blood?, Osmosis, Diffusion due to concentration gradient, Facilitated transport by ATP, Active transport.
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Respiratory System
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