How does the skin contribute to the body's sensory functions?

• By regulating blood pressure

• By providing sensations such as pressure, heat, cold, and pain

• By producing hormones

• By storing fat

What waste removal process is a function of the skin?

• Excretion through sweat

• Filtration through kidneys

• Digestion in the stomach

• Absorption in the intestines

Lily accidentally scraped her knee while playing outside. She noticed that only the very top layer of her skin was affected. What is the top layer of the skin called?

• Stratum corneum

• Stratum lucidum

• Stratum granulosum

• Stratum spinosum

Which layer of the epidermis is only found in the thick skin of the palms and soles of feet?

• Stratum corneum

• Stratum lucidum

• Stratum granulosum

• Stratum basale

What pigment do melanocytes produce?

• Hemoglobin

• Chlorophyll

• Melanin

• Keratin

Kai spends a lot of time in the sun without protection, and UV radiation mutates one of his skin cell’s DNA. What is most likely to happen next?

• The skin becomes lighter.

• The cells begin to divide uncontrollably.

• The skin becomes thicker.

• The cells stop dividing.

What do melanocytes produce to protect the body from UV radiation?

• Keratin

• Collagen

• Melanin

• Elastin

What can UV radiation cause that results in cancer?

• Infections

• Mutations

• Inflammations

• Allergies

What is the name of the wavy layer between the epidermis and the dermis?

• Dermal papillae

• Epidermal ridge

• Subcutaneous layer

• Basal layer

Olivia notices that the skin on her fingertips has tiny ridges that help her hold onto objects more securely. What is the function of the ridges formed by the dermal papillae?

• Increase friction for better grip

• Protect against UV radiation

• Store fat for insulation

• Produce melanin