Chapter 6: Skin and Membranes Flashcards
What are the two main categories of membranes in the body?
Epithelial Membrane and Connective Tissue membranes
Which of the body’s membranes are types of epithelial membranes?
1) Cutaneous Membrane 2) Serous Membrane 3) Mucous Membrane
What fluid(s) is/are produced by serous, mucous, and synovial membranes?
1) Serous Fluid 2) Mucus 3) Synovial Fluid
What is the function of serous fluid?
It’s a thin, watery fluid that reduces friction between the two layers and provides lubrication when organs rub against one another or against the walls of the cavities that contain them.
What is the function of mucus?
Mucus keeps the membranes moist and soft.
What is the function of synovial fluid?
It’s a smooth, slick, thick, colorless lubricating fluid that resembles egg white, and helps reduce friction between the opposing surfaces of bones in movable joints.
What is the mucocutaneous junction?
It’s the transitional area that serves as a point of “fusion” where skin and mucous membranes meet.
What are the 2 types of Serous Membranes?
1) Parietal Layer that lines the walls of a body cavity much like wallpaper covers the walls of a room, and 2) Visceral Layer that is the portion of the membrane that folds inward to cover the surface of organs within a body cavity.
What is the Lamina Propria?
The fibrous connective tissue underlying the epithelium in mucous membranes.
What is the only membranes that contains both epithelial AND connective tissue?
Mucous membrane
What 2 layers make up the skin (or cutaneous membrane)?
1) The Epidermis, the outermost layer of the skin, and 2) Dermis, the deeper of the two layers.
What layer of the epidermis constantly undergoes mitosis and reproduce themselves?
The stratum germinativum.
What is the tough outermost layer of the epidermis called?
The stratum corneum.
What is the primary function of melanin?
To absorb harmful ultraviolet (UV) radiation from sunlight before it reaches tissues below the outer layers of the epidermis.
The junction that exists between the thin superficial epidermal layer of skin and the deeper dermal layer forms a type of basement membrane called the _____.
Dermal-epidermal junction.
Tissue that lies deep to the dermis and forms a connection between the skin and underlying structures of the body such as muscle and bone and is sometimes called the superficial fascia or hypodermis is the _____.
subcutaneous tissue
Define Lanugo.
It is the hair of a newborn infant which is extremely fine and soft.
____ is a specialized smooth muscle that produces “goose bumps” and causes hair to stand up straight.
Arrector pili
This skin receptor detects pressure deep in the dermis.
Lamellar Corpuscle (Pacini corpuscle)
This skin receptor detects superficial, light touch.
Tactile corpuscle (Meissner corpuscle)
What are the 2 types of sudoriferous (sweat) glands?
Eccrine and Apocrine Sweat Glands
What is the function of Eccrine Sweat Glands?
These sweat glands are far more numerous and widespread and they produce perspiration, or sweat.
What is the function of Apocrine Sweat Glands?
These sweat glands are found mainly in the armpit and in the pigmented skin around the genitals, and produce a thicker secretion instead of perspiration (sweat).
Where in the skin would you find layers of dead, keratinized cells?
stratum corneum
