Integumentary System Review

Which of the following DOES NOT contribute to how the skin to protects you from injury?

• The skin is filled with keratin, a damage-resistant protein

• Skin cells of the epidermis divide rapidly, so damaged cells can be quickly replaced

• There are very few blood vessels in the superficial layers of the skin, so when damage occurs bleeding is minimal

• Some regions of the body are covered by skin that can harden into a cartilage-like substance immediately upon being damaged

Which of the following IS NOT one of the ways in which your skin protects against infections?

• Most of the surface of the skin is dry, which makes it hard for bacteria or fungi to survive

• Sweat contains antimicrobial compounds that can damage or kill infectious cells

• There are some species of "friendly" bacteria that live on and in the skin that can fight off infectious bacteria

• In response to acute infection, large sections of the skin may detach all at once to protect the rest of the body

Which of the following IS NOT one of the ways in which the skin protects the body from temperature changes?

• Sweat glands can prevent overheating via evaporative cooling

• Blood vessels in the skin can change their diameter to control blood flow, thereby influencing heat loss

• Adipose tissue in the hypodermis helps to trap body heat within the body

• Certain cells in the epidermis may vibrate in response to extreme cold, thus generating small amounts of body heat

The epidermis contains several keratinized layers of skin cells that help protect against water loss. What would you expect to happen if the number of cell layers in the epidermis was doubled?

• Water loss would decrease

• Water loss would increase

• The body's rate of water loss would be unaffected

• The body would begin to actively absorb water from the atmosphere

Which of the following are events that would be WORSENED with decreased melanin content in the skin? Select all that apply.

• Sunburn

• Skin cancer

• Skin repair and healing

• Vitamin D production

Which of the following are events that would be WORSENED with increased melanin content in the skin? Select all that apply.

• Sunburn

• Skin cancer

• Skin repair and healing

• Vitamin D production

Which of these molecules is responsible for protecting the skin against UV damage?

• Melanin

• Keratin

• Collagen

• Elastin

Which cell type produces melanin?

• Keratinocytes

• Melanocytes

• Fibroblasts

• Integucytes

Which of these molecules is most responsible for protecting the skin against physical damage such as scrapes, cuts, etc.?

• Melanin

• Keratin

• Collagen

• Elastin

Which cell type produces keratin?

• Keratinocytes

• Melanocytes

• Fibroblasts

• Integucytes