Integumentary System Overview
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Questions and Answers

What is the primary function of the lunula?

  • To secrete keratin for nail formation
  • To protect the nail root from injury
  • To indicate the location of nail growth (correct)
  • To produce melanin for nail pigmentation
  • Which type of gland secretes ear wax?

  • Sebaceous glands
  • Ceruminous glands (correct)
  • Eccrine glands
  • Apocrine glands
  • Which of the following is NOT a mechanism of heat loss from the body?

  • Convection
  • Conduction
  • Radiation
  • Absorption (correct)
  • What is the primary function of melanin in hair?

    <p>To determine the color of hair (B)</p> Signup and view all the answers

    How does blood contribute to thermoregulation?

    <p>By transporting heat throughout the body (D)</p> Signup and view all the answers

    What is the key difference between eccrine and apocrine sweat glands?

    <p>Eccrine glands are primarily responsible for temperature regulation, while apocrine glands are associated with hair follicles (C)</p> Signup and view all the answers

    Which statement about the core temperature of the body is TRUE?

    <p>Core temperature is relatively stable and maintained within a narrow range (D)</p> Signup and view all the answers

    Which of the following factors can affect heat production in the body?

    <p>Hormonal levels (C)</p> Signup and view all the answers

    What primary support structure lies beneath the epidermis?

    <p>Dermis (D)</p> Signup and view all the answers

    Which of the following plays a significant role in the insulation of the body?

    <p>Hypodermis (B)</p> Signup and view all the answers

    What is a common physiological change that affects skin color?

    <p>Blood vessel dilation (A)</p> Signup and view all the answers

    What role does the dermis play in relation to drug reactions?

    <p>Reflects chronic irritation (B)</p> Signup and view all the answers

    Which pigment is associated with yellow skin tone?

    <p>Carotene (A)</p> Signup and view all the answers

    What danger is associated with the skin’s ability to absorb chemicals?

    <p>Absorption of toxins (B)</p> Signup and view all the answers

    Which of the following conditions is caused by a malfunction of melanocytes?

    <p>Albinism (B)</p> Signup and view all the answers

    What is the primary connective tissue role of the hypodermis?

    <p>Anchors skin to underlying structures (C)</p> Signup and view all the answers

    Which of the following is NOT a function of the integumentary system?

    <p>Stores calcium for bone health (A)</p> Signup and view all the answers

    What are the two main layers of the skin?

    <p>Epidermis and Dermis (A)</p> Signup and view all the answers

    What characterizes the stratum corneum?

    <p>It consists of dead, flattened cells (C)</p> Signup and view all the answers

    Which statement best defines thermoregulation?

    <p>The maintenance of stable body temperature (B)</p> Signup and view all the answers

    What is the primary role of keratin in the skin?

    <p>To make skin cells hard and water-resistant (D)</p> Signup and view all the answers

    Which layer of skin contains accessory structures such as hair and glands?

    <p>Dermis (A)</p> Signup and view all the answers

    Which type of perspiration cannot be easily observed by the body?

    <p>Insensible perspiration (A)</p> Signup and view all the answers

    Which of the following factors influences skin color?

    <p>Production of melanin (A)</p> Signup and view all the answers

    What mechanism does the hypothalamus use to conserve heat?

    <p>Shivering (C)</p> Signup and view all the answers

    What is a primary reason newborns lose more heat than they produce?

    <p>Larger surface area (C)</p> Signup and view all the answers

    Which of the following conditions is characterized by an abnormally high body temperature?

    <p>Hyperthermia (D)</p> Signup and view all the answers

    Which classification of burns includes second-degree burns?

    <p>Partial thickness burns (C)</p> Signup and view all the answers

    What does eschar do in the context of burn injuries?

    <p>Acts like a tourniquet (C)</p> Signup and view all the answers

    What is a recommended skin care practice for all ages to minimize skin damage?

    <p>Reduce exposure to UV radiation (D)</p> Signup and view all the answers

    What is the main metabolic process relied upon by newborns to generate heat?

    <p>Nonshivering thermogenesis (C)</p> Signup and view all the answers

    Which condition is categorized as a state of abnormally low body temperature?

    <p>Hypothermia (A)</p> Signup and view all the answers

    Flashcards

    Stratum corneum

    The outermost layer of skin, composed of dead, flattened cells that shed.

    Stratum germinativum

    The deeper layer of the epidermis where cells continuously divide and move towards the surface.

    Keratinization

    The process where the protein keratin makes skin cells tough, flat, and waterproof.

    Subcutaneous layer

    The layer beneath the dermis, mainly made of fat and connective tissue, providing insulation and cushioning.

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    Thermoregulation

    The process where the body regulates its internal temperature.

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    Sensible perspiration

    The skin's ability to release sweat, which evaporates and cools the body.

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    Insensible perspiration

    The skin's continuous evaporation of water, even without visible sweating.

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    Heat conservation

    The process of the body conserving heat by constricting blood vessels and reducing blood flow to the skin.

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    Hair's Functions

    Hair's role in detecting insects, protecting the eyes, and preventing dust from entering the lungs.

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    Melanin's Role

    The pigment that influences hair color.

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    Hair Origin

    The outermost layer of skin where hair originates.

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    Lunula

    The part of a nail that shows nail growth.

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    Nail Composition

    Nails are made up of the free edge, nail body, and nail root.

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    Sebaceous Glands

    Oil glands that secrete sebum.

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    Eccrine Glands

    Sweat glands that are crucial for regulating body temperature.

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    Apocrine Glands

    Sweat glands associated with hair follicles and become more active during puberty.

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    Hypothalamus

    The part of the brain that controls body temperature by initiating mechanisms like sweating and shivering.

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    Heat Loss

    The body's ability to lose heat through dilated blood vessels and sweating.

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    Nonshivering thermogenesis

    A newborn's unique way of generating heat by burning brown fat.

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    Normothermia

    Normal body temperature.

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    Pyrexia

    Elevated body temperature, typically due to infection or illness.

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    Hyperthermia

    Extremely high body temperature, possibly leading to heat stroke.

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    Hypothermia

    Dangerously low body temperature.

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    What is the dermis?

    The layer of skin that supports the epidermis and contains blood vessels, nerve endings and hair follicles.

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    What is the subcutaneous layer?

    The layer of tissue beneath the skin that helps insulate the body and anchors the skin to underlying structures.

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    What is melanin?

    A dark pigment produced by melanocytes in the epidermis. It determines the shade of skin color and protects against UV damage.

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    What is carotene?

    A yellow pigment that contributes to skin color, particularly in those with lighter skin tones.

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    What is albinism?

    A condition characterized by a decrease in the production of melanin, resulting in a lack of pigmentation in the skin.

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    What is vitiligo?

    A condition in which melanocytes die or stop producing melanin, resulting in patches of depigmentation on the skin.

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    How does the skin function as a barrier?

    The skin's ability to absorb chemicals and medications, leading to local or systemic effects.

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    How can changes in skin color indicate health conditions?

    A visible change in skin color that can be caused by physiological changes like blushing or pallor, or pathological changes like cyanosis, jaundice or ecchymosis.

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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.

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