Skin Structure and Growth Quiz

Cosmetologists should have a thorough understanding of skin structure and growth because __________.

Answer explanation

Cosmetologists need to understand skin structure and growth to effectively assess skin conditions, choose appropriate treatments, and ensure client safety, leading to better results in their services.

Tags

CCSS.RI.11-12.3

CCSS.RI.11-12.5

CCSS.RI.8.3

CCSS.RI.9-10.3

CCSS.RI.9-10.5

The __________ is the outermost and thinnest layer of the skin and is made up of five layers—stratum corneum, stratum lucidum, stratum granulosum, stratum spinosum, and stratum germinativum.

• epidermis

• dermis

• hypodermis

• subcutaneous layer

Answer explanation

The epidermis is the outermost layer of the skin, consisting of five layers: stratum corneum, stratum lucidum, stratum granulosum, stratum spinosum, and stratum germinativum. The dermis and hypodermis are deeper layers.

__________ is a fibrous protein that is also the principal component of the skin, hair, and nails.

• Collagen

• Keratin

• Elastin

• Actin

Answer explanation

Keratin is a fibrous protein that forms the primary structure of skin, hair, and nails, making it the correct answer. Collagen and elastin are also proteins but serve different functions in the body.

Differences in genetic skin color among people are due to __________.

• A) Melanin

• B) Collagen

• C) Elastin

• D) Keratin

Answer explanation

Differences in genetic skin color among people are primarily due to melanin, a pigment produced in the skin. Higher melanin levels result in darker skin, while lower levels lead to lighter skin, making A) Melanin the correct choice.

The skin gets its strength, form, and flexibility from two protein fibers found within the __________.

• A) Dermis

• B) Epidermis

• C) Hypodermis

• D) Stratum corneum

Answer explanation

The skin's strength, form, and flexibility come from collagen and elastin fibers located in the dermis, making option A the correct choice. The epidermis and hypodermis do not contain these protein fibers.

Tags

CCSS.RI.9-10.4

CCSS.L.9-10.4

__________ is a fibrous, connective tissue made from protein that gives the skin form and strength.

• Collagen

• Elastin

• Keratin

• Melanin

Answer explanation

Collagen is a fibrous connective tissue that provides structure and strength to the skin, making it the correct answer. Elastin provides elasticity, keratin is a protective protein, and melanin is responsible for skin color.

Tags

CCSS.RI.9-10.4

CCSS.L.9-10.4

Identify a factor that weakens collagen.

• A) UV exposure

• B) Hydration

• C) Vitamin C

• D) Exercise

Answer explanation

UV exposure weakens collagen by breaking down its structure, leading to skin damage and aging. In contrast, hydration, vitamin C, and exercise support collagen production and maintenance.

What is the primary role of melanin in the skin?

• Protects against UV radiation

• Provides skin elasticity

• Strengthens collagen

• Hydrates the skin

Answer explanation

The primary role of melanin in the skin is to protect against UV radiation. It absorbs harmful UV rays, reducing the risk of skin damage and cancer, making this the correct choice.

Glands that are connected to the hair follicles and secrete sebum are called __________.

• Sudoriferous glands

• Sebaceous glands

• Endocrine glands

• Exocrine glands

Answer explanation

Sebaceous glands are the glands connected to hair follicles that secrete sebum, an oily substance that helps lubricate the skin and hair. Sudoriferous glands produce sweat, while endocrine glands secrete hormones.

Tags

CCSS.RI.9-10.4

CCSS.L.9-10.6

Which of the following is a fatty or oily secretion that lubricates the skin and preserves the softness of the hair?

• A) Sweat

• B) Sebum

• C) Saliva

• D) Mucus

Answer explanation

Sebum is the oily secretion produced by sebaceous glands that lubricates the skin and hair, helping to maintain softness. Sweat cools the body, saliva aids in digestion, and mucus protects membranes, but only sebum serves this specific function.