Which Human Body Part Increases 10x Its Size When Stimulated?

During a 6th-grade science lesson, Mrs. Parks, the teacher, asked the class, “Which human body part increases to ten times its size when stimulated?” 

The room fell silent for a moment until one of the students, Mary, couldn’t hold back any longer. 

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She stood up and, clearly upset, exclaimed:

“You shouldn’t ask sixth-graders a question like that! I’ll tell my parents, and they’ll report you to the principal, and you’ll get fired!”

Mrs. Parks, keeping calm, repeated the question for the class, emphasizing its purely scientific nature.

“Which body part increases to 10 times its size when stimulated?”

Still fuming, Mary turned to her classmates with wide eyes. 

“She’s definitely getting in trouble for this!” she declared, sure of her belief.

Without losing her composure, Mrs. Parks waited patiently for someone to answer. 

She asked again, “Does anyone know the answer?”

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Finally, Billy, one of the quieter students, nervously raised his hand and stood up.

After glancing around at his classmates, he said:

“The body part that increases ten times its size when stimulated is the pupil of the eye.”

Mrs. Parks smiled, pleased with his answer. She congratulated Billy on getting it right. 

Then, she turned her attention back to Mary and, with a gentle but firm tone, said:

“As for you, young lady, I have three things to say: First, you have a dirty mind. 

“Second, you didn’t do your homework. And third, one day, you’re going to be very, very disappointed.”