Question

Explain why it does not hurt when you get a haircut.

   Explain why it does not hurt when you get a haircut.

Glencoe Biology

Glencoe Biology

Alton Biggs 1st Edition

Chapter 32, Problem 12

Instant Answer

Solved by Expert Dennis Howard

05/15/2020

Step 1

The visible part of the hair that we see on the outside is in the epidermis layer. Show more…

Show all steps

lock

Thanks for your feedback!

Explain why it does not hurt when you get a haircut.

Play audio

Feedback

Powered by NumerAI

Dennis Howard and 66 other subject Biology educators are ready to help you.

Ask a new question

Labs

Want to see this concept in action?

NEW

Explore this concept interactively to see how it behaves as you change inputs.

View Labs

Key Concepts

Hair Anatomy

Human hair is composed primarily of a shaft made of dead, keratinized cells, meaning the material being cut is not alive and does not contain nerve endings. This structural property is fundamental in understanding why any mechanical alteration like cutting does not induce pain.

Nociceptors and Pain Perception

Pain sensation is mediated by specialized sensory nerve endings known as nociceptors, which are located in living tissues such as the skin. Since the hair shaft lacks living cells and nerve fibers, cutting it does not trigger these receptors or send pain signals to the brain.

Cellular Composition and Function

The distinction between living and non-living tissue components is key in physiology. Hair predominantly consists of non-living cells, which explains why processes that affect living tissues, and thus cause pain, do not have the same effect on hair.

Recommended Videos

Transcript

Ace is your personal tutor. It breaks down any question with clear steps so you can learn.

Start Using Ace

Continue solving this problem

Create a free account to:

View full step-by-step solution
Ask follow-up questions with Ace AI
Save progress and study later