During a normal inspiration, which event occurs first?

A. air flows into lungs
B. alveolar pressure becomes subatmospheric
C. diaphragm contracts
D. intrapleural pressure becomes more negative
E. thoracic volume increases


Answer: C. diaphragm contracts

Anatomy & Physiology

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Given the following list of organic molecules, which includes hormones? 1) Nucleic acid derivatives 2) Polypeptides 3) Steroids 4) Proteins

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Anatomy & Physiology