Final answer:
Baroreceptors are not found in the oral cavity. They are specialized receptors for detecting pressure changes in the walls of the carotid artery, aorta, and lungs, but not in the digestive system such as the colon.
Step-by-step explanation:
Baroreceptors are specialized stretch receptors that detect pressure changes within certain organs by sensing the stretch of the organ wall, most notably within the cardiovascular system. These receptors are primarily found in the walls of the carotid artery and the aorta, where they play a crucial role in monitoring blood pressure and contributing to cardiovascular homeostasis through the baroreceptor reflex. Additionally, baroreceptors are located in the lungs where they assess lung expansion. As for the digestive tract and the colon, they contain stretch receptors but not specifically baroreceptors. Therefore, baroreceptors are not found in the colon and oral cavity, indicating that the correct answer to the students' question is option (e).