RASA First Assist Practice Test 2025 – Complete Exam Preparation

Question: 1 / 400

What is the primary substance that composes a layer of the epidermis and plays a role in hardening nails and hair?

Collagen

Keratin

The primary substance that composes a layer of the epidermis, specifically involved in the hardening of nails and hair, is keratin. Keratin is a fibrous protein that provides structural strength and resilience to these parts of the body. In the epidermis, keratinocytes produce keratin, which contributes to the protective barrier of the skin and helps to prevent water loss, while also providing a tough, protective layer for hair and nails.

Collagen is primarily found in the dermis layer of the skin and provides structural support and strength, but it is not the main component of the outer epidermis. Elastin also resides in the dermis and is responsible for the elasticity of the skin, helping it return to its original shape after stretching. Melanin, on the other hand, is the pigment responsible for skin and hair color, contributing to protection against ultraviolet light but does not play a role in the hardening process of nails and hair.

Get further explanation with Examzify DeepDiveBeta

Elastin

Melanin

Next Question

Report this question

Download RASA First Assist Practice Test 2025 – Complete Exam Preparation PDF Study Guide
Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy