Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

Goblet cells secrete serous fluid into the respiratory tract.

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

The framework of the larynx is formed by nine pieces of cartilage, the largest of which is the thyroid cartilage.

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The pseudostratified ciliated columnar epithelium of the respiratory tract warms, filters, and humidifies the inspired air.

The function of the epiglottis is to:

a. Contract muscularly to cover the laryngopharynx

b. Vibrate to produce sound

c. Trigger a cough reflex

d. Cover the glottis during swallowing

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

Each Hb protein can carry up to four oxygen molecules.

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

Hb in arterial blood is normally almost fully saturated.

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

When the PO₂ of arterial blood drops slightly, the percent saturation of Hb drops dramatically.

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

Increased P_CO2, temperature, and hydrogen ion concentration all increase Hb's affinity for oxygen.