Final answer:
When someone sneezes, it is usually because their body is trying to remove irritants from their nasal passages. Sneezing is a reflex action that helps to expel foreign substances such as dust, pollen, or viruses. It is a protective mechanism to keep the respiratory system clear.
Step-by-step explanation:
When someone sneezes, it is usually because their body is trying to remove irritants from their nasal passages. Sneezing is a reflex action that helps to expel foreign substances such as dust, pollen, or viruses that may have entered the nose. The teacher could support the student's ideas by explaining that the act of sneezing is a protective mechanism to keep the respiratory system clear.
To further support this explanation, the teacher could mention that sneezing is often triggered by an irritation in the nasal lining. The irritation can activate sensory nerves, which then send signals to the brain. The brain responds by initiating a series of muscle contractions, including those in the chest, throat, and nose, leading to a strong exhale of air.
Overall, sneezing is an important defense mechanism for our respiratory system and helps to keep our airways clear of potential harmful substances.