Final answer:
Dyspnea is difficulty in breathing, apnea is the cessation of breathing, and orthopnea is shortness of breath when lying down.
Explanation:
Dyspnea, Apnea, and Orthopnea Definitions
Dyspnea refers to difficulty in breathing, where a person feels a mismatch between breathing stimuli and muscle response. Apnea is the cessation of breathing, commonly seen in sleep apnea. Orthopnea is shortness of breath when lying down, relieved by sitting or standing.
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