20 Questions
What are the three distinctive layers that form the skin?
The epidermis, the dermis, and the hypodermis (subcutaneous layer)
What specialized cells are found in the epidermis, and what are their functions?
Langerhans cells are macrophages that phagocytize infectious agents and then travel to lymphatic organs. Melanocytes produce melanin pigment responsible for skin color.
What is the outermost layer of the epidermis composed of?
The outermost layer of the epidermis is composed of flattened, dead cells known as the stratum corneum.
In which layer of the epidermis do cells begin to die, and what is it named for?
Cells begin to die in the stratum granulosum, which is named for the abundance of granules present.
What type of tissue is the dermis composed of?
The dermis is composed of dense irregular connective tissue.
What is the function of carotene pigment in the epidermis and dermis?
Carotene pigment gives a yellowish form, particularly in Asian peoples.
What is the function of the sebaceous gland?
The sebaceous gland produces sebum (oil) to help keep the skin soft and pliable.
Where are the free nerve endings located?
The free nerve endings are associated with pain sensation and are located near the dermal papillae.
What is the primary function of the skin?
The most important function of the skin is protection, serving as a barrier against infection, UV light, and disease.
Where are Meissner's corpuscles located?
Meissner's corpuscles, which are touch receptors associated with tactility, are located near the dermal papillae.
What is the composition of sweat produced by the sweat gland?
Sweat produced by the sweat gland is a mixture of water, salts, and urea which acts to cool the body.
What is the function of the arrector pili muscle?
The arrector pili muscle pulls up the hair follicle, leading to goose flesh or 'goose bumps'.
What is the role of Pacinian corpuscles?
Pacinian corpuscles are pressure receptors located deep within the dermis at the boundary of the dermis and hypodermis.
What are the components of sebum secreted by the sebaceous gland?
Sebum secreted by the sebaceous gland is a complex lipid which is bactericidal and fungistatic.
What is the function of the apocrine sweat glands?
The apocrine sweat glands are responsible for the odor of the body and open directly into the hair follicle.
Where are the blood vessels that supply nutrition to the skin located?
The blood vessels that supply nutrition to the skin are located in two horizontal layers: the deep plexus just above the subcutaneous fat, and a superficial plexus in the papilla.
Which layer of the skin is responsible for producing the melanin pigment?
Epidermis
What type of tissue forms the outermost layer of the epidermis?
Keratinized stratified squamous epithelium
Which layer of the skin contains carotene pigment responsible for giving a yellowish tone to the skin?
Dermis
What is the primary function of Langerhans cells in the skin?
Phagocytize infectious agents
Explore the composition and characteristics of the three distinctive layers of the skin: epidermis, dermis, and hypodermis. Learn about the specialized cells such as Langerhans cells and melanocytes, and their roles in maintaining the health and appearance of the skin.
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