GCU BIO210 Module 5

"List and describe some of the basic characteristics of the skin."

"The skin has several basic characteristics including: 1. Protection - acts as a barrier against pathogens and physical damage. 2. Sensation - contains nerve endings that respond to touch, temperature, and pain. 3. Thermoregulation - helps regulate body temperature through sweat and blood flow. 4. Excretion - removes waste products through sweat. 5. Vitamin D synthesis - aids in the production of vitamin D when exposed to sunlight."

"List and describe some of the functions of the skin."

"The skin serves multiple functions: 1. Protection - shields underlying tissues from injury and infection. 2. Sensation - detects environmental changes through sensory receptors. 3. Thermoregulation - maintains body temperature through sweat and blood flow adjustments. 4. Excretion - eliminates waste through sweat. 5. Absorption - allows certain substances to enter the body."

"What type of epithelium is the skin composed of?"

"The skin is primarily composed of stratified squamous epithelium, which provides a protective barrier due to its multiple layers of cells."

"List the 5 layers of the epidermis from deep to superficial and describe their characteristics."

"The five layers of the epidermis are: 1. Stratum basale - deepest layer, where cell division occurs. 2. Stratum spinosum - provides strength and flexibility, contains desmosomes. 3. Stratum granulosum - cells begin to die and keratinize, contains keratohyalin granules. 4. Stratum lucidum - found only in thick skin, provides an extra layer of protection. 5. Stratum corneum - outermost layer, composed of dead, keratinized cells that protect against environmental damage."

"Explain what it means for the epidermis to be avascular and how it receives oxygen and nutrients."

"The epidermis is avascular, meaning it lacks blood vessels. It receives oxygen and nutrients through diffusion from the underlying dermis, where blood vessels are present."

"Identify the layer of the epidermis found only in the palms of the hands and soles of the feet."

"The layer found only in the palms of the hands and soles of the feet is the stratum lucidum, which provides an additional layer of protection in these high-friction areas."

"List the cell types found in the epidermis and their functions."

"The epidermis contains several cell types: 1. Keratinocytes - produce keratin for protection. 2. Melanocytes - produce melanin for pigmentation and UV protection. 3. Langerhans cells - act as immune responders. 4. Merkel cells - function in touch sensation."

"Explain the process of keratinization and the life history of a keratinocyte."

"Keratinization is the process by which keratinocytes move from the stratum basale to the surface of the skin, undergoing changes as they mature. They produce keratin, lose their nuclei, and eventually die, forming a protective layer of dead cells in the stratum corneum."

"Describe the two major layers of the dermis and their structures and functions."

"The two major layers of the dermis are the papillary layer and the reticular layer. The papillary layer is thin, contains loose connective tissue, and has dermal papillae that enhance surface area for nutrient exchange and sensation. The reticular layer is thicker, composed of dense irregular connective tissue, providing strength and elasticity, and contains larger blood vessels, nerves, and receptors for cutaneous sensation."

"Describe how a blister forms."

"A blister forms when there is friction or damage to the skin, causing separation between the epidermis and dermis. This separation allows fluid to accumulate in the space, creating a raised area filled with serum."

"Define lines of cleavage and their clinical significance."

"Lines of cleavage, or Langer's lines, are patterns of collagen fibers in the dermis that indicate the direction of skin tension. Their clinical significance lies in surgical procedures; incisions made along these lines heal better and result in less scarring."

"Explain the 'Rule of 9’s' for estimating burned surface area of the skin."

"The 'Rule of 9’s' is a method used to estimate the total body surface area affected by burns. The body is divided into sections, each representing approximately 9% (or multiples thereof) of the total body surface area, allowing for quick assessment in emergency situations."

"Describe the anatomy of the hypodermis."

"The hypodermis, also known as subcutaneous tissue, is composed of loose connective tissue and fat cells. It serves as an insulator, cushioning underlying structures and allowing for flexibility and movement."

"List and describe the functions of the hypodermis."

"The hypodermis has several functions: 1. Insulation - helps maintain body temperature. 2. Energy storage - stores fat for energy reserves. 3. Protection - cushions underlying organs and tissues. 4. Anchoring - connects the skin to underlying structures."

"Is the hypodermis considered a layer of the skin?"

"The hypodermis is not considered a layer of the skin; it is a subcutaneous layer that supports and anchors the skin to underlying tissues."

"Explain the reason for administering shots into the hypodermis."

"Shots are often given into the hypodermis because this layer of skin contains a rich supply of blood vessels, allowing for faster absorption of the medication into the bloodstream."

"List and discuss the causes of variations in skin color."

"Variations in skin color can be caused by factors such as genetics, melanin production, exposure to sunlight, and certain medical conditions. Genetics determines the baseline skin tone, while melanin production can increase with sun exposure, leading to tanning. Conditions like albinism or vitiligo can also affect skin color."

"Identify the major abnormal colors of diagnostic value found in the skin and describe their characteristics."

"Major abnormal colors include cyanosis (bluish tint indicating low oxygen), jaundice (yellowing indicating liver issues), erythema (redness indicating inflammation), and pallor (paleness indicating reduced blood flow). Each color can provide insights into underlying health conditions."

"List and describe some common skin markings."

"Common skin markings include moles (nevi), which are pigmented spots; freckles, which are small brown spots from sun exposure; and birthmarks, which are congenital skin lesions. Each has distinct characteristics and can vary in size and color."

"Identify the regions where hair is found and where it is not found on the body."

"Hair is found on most parts of the body, including the scalp, face, arms, and legs. It is not found on the palms of the hands, soles of the feet, and certain areas of the genitals."

"Compare and contrast the different types of hair."

"The main types of hair include terminal hair (thick, long, and pigmented, found on the scalp and body), vellus hair (fine, short, and unpigmented, found on most of the body), and lanugo (soft, fine hair found on fetuses). Terminal hair is more robust than vellus hair."

"Describe the function of the arrector pili muscle and its type of muscle tissue."

"The arrector pili muscle is responsible for causing hair to stand upright (goosebumps) in response to cold or fear. It is composed of smooth muscle tissue."

"Define alopecia and list some common causes of this condition."

"Alopecia is a condition characterized by hair loss. Common causes include genetic predisposition, hormonal changes, autoimmune disorders, and certain medications."

"List and describe the functions of hair."

"Functions of hair include providing insulation, protecting the skin from UV radiation, enhancing sensory perception, and playing a role in social and sexual signaling."

"Compare and contrast merocrine, apocrine, and holocrine modes of secretion."

"Merocrine secretion involves exocytosis of secretory products without loss of cellular material, apocrine secretion involves the release of products along with part of the cell membrane, and holocrine secretion involves the entire cell disintegrating to release its contents."

"What is a sudoriferous gland?"

"A sudoriferous gland, also known as a sweat gland, is a gland in the skin that produces sweat to help regulate body temperature and excrete waste."

"Compare and contrast the structure and function of eccrine and apocrine sweat glands, including their modes of secretion."

"Eccrine sweat glands are coiled tubular glands that secrete sweat directly onto the skin surface for thermoregulation, using merocrine secretion. Apocrine sweat glands are larger, located in specific areas (like armpits), and secrete a thicker fluid into hair follicles, using apocrine secretion."

"Differentiate between sensible and insensible perspiration, and explain if all perspiration is insensible water loss."

"Sensible perspiration is the noticeable sweating that occurs during exercise or heat, while insensible perspiration is the continuous, unnoticed loss of water through the skin. Not all perspiration is insensible water loss; sensible perspiration is a distinct process."

"Define diaphoresis."

"Diaphoresis refers to excessive sweating, often due to heat, exercise, or medical conditions."

"What are the major functions of sebaceous glands, their mode of secretion, and where they empty their contents?"

"Sebaceous glands produce sebum, which lubricates and waterproofs the skin and hair. They use holocrine secretion and typically empty their contents into hair follicles."

"What are ceruminous glands and their mode of secretion?"

"Ceruminous glands are specialized sweat glands located in the ear canal that produce earwax (cerumen). They use a modified apocrine mode of secretion."

"Describe the purpose of the product produced by mammary glands."

"The primary purpose of the product produced by mammary glands is to provide nutrition to infants in the form of milk."

"Explain what mammary glands are and their mode of secretion."

"Mammary glands are specialized exocrine glands in mammals that produce milk. They primarily use a merocrine mode of secretion, where secretions are released via exocytosis."

"Outline the different types of skin cancer."

"The main types of skin cancer include basal cell carcinoma, squamous cell carcinoma, and melanoma, each varying in severity and treatment."

"Outline the different causes and types of burns."

"Burns can be caused by heat, chemicals, electricity, or radiation. They are classified into first-degree, second-degree, and third-degree burns based on severity."

"Summarize the major effects that aging has on the integument."

"Aging affects the integument by reducing elasticity, causing thinning of the skin, decreasing moisture content, and increasing the risk of skin lesions and cancers."

"Describe the steps involved in the repair of the integument."

"The repair of the integument involves primary and secondary hemostasis, vasoconstriction, inflammation, proliferation, and remodeling, including the formation of granulation tissue and scar tissue."

"List the cardinal signs of inflammation and their Latin roots."

"The cardinal signs of inflammation are redness (rubor), heat (calor), swelling (tumor), pain (dolor), and loss of function (functio laesa)."

"Explain the timing of events during wound healing."

"Wound healing occurs in phases: hemostasis, inflammation, proliferation, and remodeling, each with specific timing and processes."

"List and describe factors affecting the rate of wound healing."

"Factors affecting wound healing include age, nutrition, blood supply, presence of infection, and underlying health conditions."

"Compare and contrast healing by primary, secondary, and tertiary intention."

"Primary intention involves direct closure of a wound, secondary intention involves healing from the edges inward, and tertiary intention involves delayed closure after infection control."

"Define atrophy, necrosis, gangrene, decubitus ulcer, and apoptosis."

"Atrophy is the reduction in size of a tissue; necrosis is cell death due to injury; gangrene is tissue death due to lack of blood supply; a decubitus ulcer is a pressure sore; apoptosis is programmed cell death."