1. Explain the purpose of the specialized cells in the respiratory mucosa.
2. a. Describe the function of the external intercostal muscles.
b. Describe the mechanism of and the energy required for quiet expiration and for forced expiration.
3. a. Describe the location of the chemoreceptors that respond to elevated carbon dioxide levels and those that respond to low oxygen levels.
b. Which gas creates the primary respiratory drive under normal circumstances?
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