The Integumentary System, Part 1 - Skin Deep: Crash Course Anatomy & Physiology #6

What are some primary functions of the skin?

• Pumping blood and digesting food

• Protecting against infection, regulating temperature, and synthesizing Vitamin D

• Filtering waste and producing hormones

• Storing memories and controlling muscles

Which of the following is NOT one of the three main layers of the skin?

• Epidermis

• Dermis

• Hypodermis

• Peridermis

How often is the outermost layer of your skin, the epidermis, completely replaced?

• Every 24 hours

• Every 4 to 6 weeks

• Every 6 months

• Once a year

What type of cells are responsible for synthesizing melanin, the pigment that gives skin its color?

• Keratinocytes

• Langerhans cells

• Melanocytes

• Merkel cells

Why do epidermal cells die as they move further from the dermis?

• They are exposed to too much sunlight.

• They lose their ability to produce keratin.

• They become too compressed and flattened.

• They move away from the blood supply.

Which layer of the epidermis is primarily responsible for producing new skin cells?

• Stratum corneum

• Stratum granulosum

• Stratum basale

• Stratum lucidum

What is a potential long-term effect of ultraviolet (UV) radiation from sunlight on the skin?

• Increased production of vitamin D

• Stronger elastic fibers

• Damage to skin cell DNA

• Thicker stratum lucidum

What structures are found in the dermis that cause you to feel pain and bleed when you get a deep cut?

• Keratinocytes and melanocytes

• Nerve fibers and blood vessels

• Adipose tissue and hair follicles

• Elastic fibers and collagen