Question

17 multiple choice 10 points
elevation of the _______ pushes the glottis against the epiglottis, keeping food out of the esophagus.
○ tongue
○ hard palate of the mouth
○ jaw
○ larynx (voice box)
18 multiple choice 10 points
starfish are what class of echinoderm?
○ asteroidea
○ echinoidea
○ ophiuroidea
○ crinoidea

Explanation:

Question 17

To solve this, we recall the anatomy of the respiratory and digestive systems. The larynx (voice box) elevates during swallowing, pushing the glottis against the epiglottis to prevent food from entering the trachea (not esophagus, but the mechanism relates to larynx elevation). The tongue, hard palate, and jaw don't have this function. So the correct option is the one related to larynx elevation.

In echinoderm taxonomy, starfish (sea stars) belong to the class Asteroidea. Echinoidea includes sea urchins, Ophiuroidea includes brittle stars, and Crinoidea includes feather stars. So we identify the class for starfish.

Answer:

D. larynx (voice box)

Question 18