#079 How We Get Our Skin Color

#079 How We Get Our Skin Color

Answer the questions on each slide as you watch this video.

Open Ended

Before you begin, think about your skin. It covers your entire body! What questions do you have about skin and skin color?

Multiple Select

What are the 3 main layers of skin? (check all that apply)

• epidermis

• dermis

• hypodermis

• sweat glands

What is Skin?

Hover your mouse over the first stop point (first white bar) and click on "More Info" to open up the section on the skin's layers.

Multiple Choice

Most of your Vitamin D is created in chemical reactions in your epidermis that requires sunlight

• True

• False

Multiple Select

What are some of the roles of the epidermis? (check all that apply)

• protects the body from the environment

• produces vitamin D

• prevents water from leaving the body

• contains hair follicles

Multiple Select

What are some of the roles of the dermis? (check all that apply)

• contains accessory structures, such as hair follicles and sweat glands

• involved in temperature regulation of the body

• contains oil glands which waterproof the skin

• contains fat cells to insulate the body

Multiple Choice

Keratinocytes and melanocytes are found in the hypodermis.

• True

• False

What are Skin Cells?

Hover your mouse over the 2nd stop point (2nd white bar) and click on "More Info" to open up the section on skin cells.

Multiple Choice

A layer of dead cells in your epidermis allows your skin to be waterproof.

• True

• False

Multiple Choice

Which type of cell produces melanin?

• dermal cells

• keratinocytes

• melanocytes

Multiple Select

Chemical reactions inside melanosomes create melanin.

• True

• False

Multiple Select

What determines your skin color? (check all that apply)

• Type of melanin

• Amount of melanin

• # of melanosomes

• # of skin cells

What is Melanin?

Hover your mouse over the 3rd stop point (3rd white bar) and click on "More Info" to open up the section on melanin.

Multiple Choice

The melanin inside the melanosomes that surround the nucleus of keratinocyte cells....

• block important nutrients from entering into the cell

• protect the cell's DNA from UV rays

• have no effect on the cell

Multiple Choice

The protection melanin provides to the DNA of keratinocytes is important because

• UV rays help the DNA to make copies of itself

• DNA can't function without the presence of UV rays

• UV rays can cause mutations in the DNA, which can lead to cancer

Multiple Choice

Skin with mostly _________ is lighter in color, while skin with mostly __________ appears brown.

• eumelanin; pheomelanin

• pheomelanin; eumelanin

How does melanin protect cells?

Hover your mouse over the 4th stop point (4th white bar) and click on "More Info" to open up the section on melanin.

Multiple Choice

As ultraviolet radiation (UV) increases,

• melanin production decreases

• melanin production increases

• melanin production is not affected

Multiple Choice

Tanning of the skin is a result of increased melanin production

• True

• False

How does sunlight cause tanning?

Hover your mouse over the last stop point (5th white bar) and click on "More Info" to open up the section on sunlight.

Multiple Choice

Based on the maps in the "How does sunlight cause tanning?" section, which of the following statements best describes the connection between skin color and UV radiation?

• the more intense UV light, the darker the skin

• the more intense the UV light, the lighter the skin

• the intensity of UV light is not related to skin color

Poll

Consider your own skin color. How does your level of eumelanin (black or brown pigment) compare to your level of pheomelanin (red or yellow pigment)?

• I think I have more eumelanin than pheomelanin

• I think I have more pheomelanin than eumelanin

• I think I have equal amounts of eumelanin and pheomelanin

Poll

Consider your own skin. Do you tend to get tan or burn in the sun?

• I tend to tan

• I tend to burn

• I tan a little, but then start to burn

Poll

Consider your own skin. Do you have freckles?

• Yes, I have freckles

• No, I do not have freckles

Open Ended

Exit Ticket: Explain the relationships between skin color, melanin, and UV radiation.