Integumentary System

Define skin and its function
Weighs more than 20 pounds
Covers 16% of the body

- protection
- regulate temperature
- absorption
- house nerve receptors
- secrete fluids
What are the skin layers?
Subcutaneous Tissue
Name the layers of the epidermis layer
Stratum corneum
Stratum lucidum
Stratum granulosum
Stratum germinativum
In what epidermis stratum are the dead cells?
Stratum corneum and lucidum
In what epidermis stratum are the melanocytes?
Stratum germinativum
In what layer of the skin are cells capable of mitosis and cell division?
Stratum germinativum
What is the dermis composed of?
Middle layer of skin
Composed of:
- connective tissue containing nerves and nerve endings
- blood vessels
- sebaceous and sweat glands
- hair follicles
- lymph vessels
Further divided into two layers:
- papillary layer
- reticular layer
What is the composition of the subcutaneous or hypodermis?
Composed of subcutaneous tissue
Tissue helps support, nourish, insulate, and cushion the skin
Name the skin accessory organs
Sebaceous glands
Sweat glands
Describe the nail characteristics and name the nail proteins
-flat platesnof keratin.
- called nail body
- cover ends of tissue by nail bed
- connected to fingers and toes.
- grow longer from the roots
- covered and protected by cuticle
- free edge is exposed edge
- light colored half-moon area at the base is the lunula
Name the hair parts and name the proteins that the hair fibersnare composed of
- hair follicles.
- hair root
- hair shaft.
- fibers composed of the protein keratin
- hair formation like
- melanin gives hair its color
- sebaceous glands
What gives hair its color?
What is released from the sebaceous gland into the follicle?
Where are the sensory receptors and what do they detect?
Located in the dermis
They detect pressue, traction, heat, cold, and pain
Define melanocytes. What do they produce?
Melanocytes are cells that produce melanin for pigmentation.
What is the most common type of skin cancer and how can we prevent skin cancer?
Basal Cell Carcinoma
To prevent skin cancer, wear proper clothing, use proper protection