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Questions and Answers
What is the primary function of the lunula?
What is the primary function of the lunula?
Which type of gland secretes ear wax?
Which type of gland secretes ear wax?
Which of the following is NOT a mechanism of heat loss from the body?
Which of the following is NOT a mechanism of heat loss from the body?
What is the primary function of melanin in hair?
What is the primary function of melanin in hair?
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How does blood contribute to thermoregulation?
How does blood contribute to thermoregulation?
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What is the key difference between eccrine and apocrine sweat glands?
What is the key difference between eccrine and apocrine sweat glands?
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Which statement about the core temperature of the body is TRUE?
Which statement about the core temperature of the body is TRUE?
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Which of the following factors can affect heat production in the body?
Which of the following factors can affect heat production in the body?
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What primary support structure lies beneath the epidermis?
What primary support structure lies beneath the epidermis?
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Which of the following plays a significant role in the insulation of the body?
Which of the following plays a significant role in the insulation of the body?
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What is a common physiological change that affects skin color?
What is a common physiological change that affects skin color?
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What role does the dermis play in relation to drug reactions?
What role does the dermis play in relation to drug reactions?
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Which pigment is associated with yellow skin tone?
Which pigment is associated with yellow skin tone?
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What danger is associated with the skin’s ability to absorb chemicals?
What danger is associated with the skin’s ability to absorb chemicals?
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Which of the following conditions is caused by a malfunction of melanocytes?
Which of the following conditions is caused by a malfunction of melanocytes?
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What is the primary connective tissue role of the hypodermis?
What is the primary connective tissue role of the hypodermis?
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Which of the following is NOT a function of the integumentary system?
Which of the following is NOT a function of the integumentary system?
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What are the two main layers of the skin?
What are the two main layers of the skin?
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What characterizes the stratum corneum?
What characterizes the stratum corneum?
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Which statement best defines thermoregulation?
Which statement best defines thermoregulation?
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What is the primary role of keratin in the skin?
What is the primary role of keratin in the skin?
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Which layer of skin contains accessory structures such as hair and glands?
Which layer of skin contains accessory structures such as hair and glands?
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Which type of perspiration cannot be easily observed by the body?
Which type of perspiration cannot be easily observed by the body?
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Which of the following factors influences skin color?
Which of the following factors influences skin color?
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What mechanism does the hypothalamus use to conserve heat?
What mechanism does the hypothalamus use to conserve heat?
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What is a primary reason newborns lose more heat than they produce?
What is a primary reason newborns lose more heat than they produce?
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Which of the following conditions is characterized by an abnormally high body temperature?
Which of the following conditions is characterized by an abnormally high body temperature?
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Which classification of burns includes second-degree burns?
Which classification of burns includes second-degree burns?
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What does eschar do in the context of burn injuries?
What does eschar do in the context of burn injuries?
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What is a recommended skin care practice for all ages to minimize skin damage?
What is a recommended skin care practice for all ages to minimize skin damage?
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What is the main metabolic process relied upon by newborns to generate heat?
What is the main metabolic process relied upon by newborns to generate heat?
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Which condition is categorized as a state of abnormally low body temperature?
Which condition is categorized as a state of abnormally low body temperature?
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Flashcards
Stratum corneum
Stratum corneum
The outermost layer of skin, composed of dead, flattened cells that shed.
Stratum germinativum
Stratum germinativum
The deeper layer of the epidermis where cells continuously divide and move towards the surface.
Keratinization
Keratinization
The process where the protein keratin makes skin cells tough, flat, and waterproof.
Subcutaneous layer
Subcutaneous layer
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Thermoregulation
Thermoregulation
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Sensible perspiration
Sensible perspiration
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Insensible perspiration
Insensible perspiration
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Heat conservation
Heat conservation
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Hair's Functions
Hair's Functions
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Melanin's Role
Melanin's Role
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Hair Origin
Hair Origin
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Lunula
Lunula
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Nail Composition
Nail Composition
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Sebaceous Glands
Sebaceous Glands
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Eccrine Glands
Eccrine Glands
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Apocrine Glands
Apocrine Glands
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Hypothalamus
Hypothalamus
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Heat Loss
Heat Loss
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Nonshivering thermogenesis
Nonshivering thermogenesis
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Normothermia
Normothermia
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Pyrexia
Pyrexia
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Hyperthermia
Hyperthermia
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Hypothermia
Hypothermia
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What is the dermis?
What is the dermis?
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What is the subcutaneous layer?
What is the subcutaneous layer?
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What is melanin?
What is melanin?
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What is carotene?
What is carotene?
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What is albinism?
What is albinism?
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What is vitiligo?
What is vitiligo?
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How does the skin function as a barrier?
How does the skin function as a barrier?
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How can changes in skin color indicate health conditions?
How can changes in skin color indicate health conditions?
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Study Notes
Integumentary System and Body Temperature
- The integumentary system includes the skin, hair, nails, and glands
- The skin serves as a mechanical barrier, protecting internal structures
- It participates in the immune response, acts as a gland for vitamin D synthesis, and performs excretory and sensory roles
- The skin regulates body temperature
Skin Structure
- The skin has two main layers: epidermis and dermis
- The epidermis is the outermost layer
- Stratum germinativum (deeper layer of epidermis) has dividing cells moving toward the surface
- Stratum corneum (surface layer of epidermis) is composed of dead, flattened cells that slough off
- Keratinization makes skin cells hard, flat, and water resistant
- The dermis layer lies beneath the epidermis, supporting it and sits above the subcutaneous layer
- The dermis contains blood vessels that nourish the epidermis
- The subcutaneous layer (hypodermis) is beneath the dermis; this layer is made of fat that insulates body temperature, and connective tissues that anchor the skin to underlying structures.
Accessory Structures
- Hair functions include detecting insects, protecting eyes, keeping dust out of lungs
- Melanin influences hair color
- Hair arises in the epidermis
- Hair also plays a cosmetic role
- Nails are made up of free edge, nail body, and nail root
- Lunula (crescent-shaped region at the base of the nail) shows nail growth
- Nails protect tips of fingers and toes from injury
- Conditions like low oxygen (deficiency) to blood can affect nail health.
- Sebaceous glands secrete oil called sebum
- Sweat glands secrete sweat
- Apocrine glands are usually associated with hair follicles; active at puberty
- Eccrine glands regulate temperature
- Modified sweat glands include mammary glands (secrete milk) and ceruminous glands (secrete ear wax)
Body Temperature
- Core temperature refers to the inner body temperature
- Shell temperature refers to the surface body temperature
- Thermoregulation involves balancing heat production and heat loss
- Metabolism is the basis of body temperature and blood disperses heat throughout the body
- Heat loss occurs primarily through skin, lungs, and excretory products
- Thermoregulation mechanisms include blood vessel dilation/constriction, sweating, and shivering
Skin, Drugs, and Chemicals
- Skin absorbs many chemicals
- Drug delivery techniques include hypodermic injections, transdermal patches, intradermal injections (for allergy testing), and topical application
- Toxin absorption is a risk
Skin Color
- Skin color is determined by genes, physiology, and sometimes pathology
- Melanin (dark pigment) is secreted by melanocytes in the epidermis
- Melanocyte malfunctions may cause conditions like albinism and vitiligo
- Carotene (yellow pigment) is present in the skin
Physiological and Pathological Skin Changes
- Physiological changes in skin color include blushing (blood vessel dilation) and pallor (blood vessel constriction)
- Pathological skin changes include cyanosis (bluish tint - poor oxygenation), jaundice (yellowing - bilirubin deposition), bronzing (melanin overproduction), and ecchymosis (black and blue bruising).
Newborns and Body Temperature
- Newborns lose more heat than they produce due to large surface area to body ratio, large bald head, and reduced insulation
- Newborns rely on nonshivering thermogenesis (metabolism of brown adipose tissue (BAT)) for heat production
- Newborns have limited capacity to dissipate heat
Thermostat
- Normothermia: Normal body temperature
- Pyrexia: Fever
- Hyperthermia: Elevated body temperature
- Hypothermia: Low body temperature
Burns
- Burns are classified by depth, with partial-thickness burns (first- and second-degree) and full-thickness burns (third-degree)
- Burns cause eschar, which acts like a tourniquet, breeding bacteria, and secreting toxins.
- Extent (area of body affected) is important in classifying burns (i.e. "rule of nines")
Skin Care
- Reduce UV radiation exposure to prevent irreversible skin damage
- Skin care is particularly important in older ages.
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Description
Explore the integumentary system, including its components like skin, hair, nails, and glands. Understand the structure of the skin, its functions, and how it regulates body temperature and protects internal structures.