Chapter 4
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Questions and Answers

What is the primary function of sebum produced by sebaceous glands?

  • To regulate body temperature by evaporative cooling
  • To provide lubrication for hair and skin (correct)
  • To stimulate hair growth and increase hair thickness
  • To produce a protective barrier against bacteria and fungi
  • Which of the following contributes to the skin's natural pigmentation?

  • Melanin, Collagen, Elastic Fibers
  • Sebum, Collagen, Hemoglobin
  • Keratin, Carotene, Sebum
  • Melanin, Carotene, Hemoglobin (correct)
  • What is the primary determinant of the reddish hue in skin?

  • Oxygen content of hemoglobin (correct)
  • Carotene concentration
  • Melanin concentration
  • Presence of dermal capillaries
  • Which layer of skin contains the majority of cutaneous sensory receptors?

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

    Which of the following describes the appearance of skin due to an impaired blood flow to an area?

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

    What is the primary function of sweat produced by eccrine glands?

    <p>To regulate body temperature through evaporative cooling (A)</p> Signup and view all the answers

    Which of the following skin appendages is NOT considered a cutaneous gland?

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

    Which of the following skin conditions is characterized by a yellow cast to the skin, indicating a liver disorder?

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

    What is the primary function of the dermal region in the hair follicle?

    <p>Provides a blood supply to the hair bulb (C)</p> Signup and view all the answers

    Which component of a hair follicle helps raise hairs in response to cold or fear?

    <p>Arrector pili muscle (B)</p> Signup and view all the answers

    What part of the nail is responsible for its growth?

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

    Which of the following is NOT a characteristic of nails?

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

    What defines a carbuncle?

    <p>Clusters of boils caused by bacterial infection (A)</p> Signup and view all the answers

    Which condition is characterized by itchy, red peeling skin between the toes?

    <p>Athlete’s foot (B)</p> Signup and view all the answers

    What is the function of the cuticle in relation to nails?

    <p>Seals the space between the nail and the skin (A)</p> Signup and view all the answers

    What type of infection causes cold sores?

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

    What is the primary function of the keratin found in the stratum corneum?

    <p>To prevent water loss from the skin (B)</p> Signup and view all the answers

    Where is melanin primarily produced in the skin?

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

    What role do epidermal dendritic cells play in the skin?

    <p>They activate and alert immune cells to threats (D)</p> Signup and view all the answers

    Which layer of the skin contains dense irregular connective tissue?

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

    What is the primary purpose of dermal papillae in the papillary layer of the dermis?

    <p>To increase friction and gripping ability (D)</p> Signup and view all the answers

    Which type of cell is associated with sensory nerve endings and acts as a touch receptor?

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

    Which skin layer is specifically formed from dead cells?

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

    What type of connective tissue is found in the papillary layer?

    <p>Areolar connective tissue (B)</p> Signup and view all the answers

    What are the primary functions of body membranes?

    <p>To cover surfaces, line cavities, and protect organs (D)</p> Signup and view all the answers

    Which type of tissue forms the cutaneous membrane?

    <p>Keratinized stratified squamous epithelium (D)</p> Signup and view all the answers

    Which statement about mucous membranes is accurate?

    <p>They line body cavities that open to the exterior and secrete mucus. (B)</p> Signup and view all the answers

    What characteristic distinguishes serous membranes from other types of epithelial membranes?

    <p>They secrete lubricating serous fluid. (C)</p> Signup and view all the answers

    Which of the following layers is typically found in epithelial membranes?

    <p>Epithelial tissue layer (A)</p> Signup and view all the answers

    What is the primary type of connective tissue found in the dermis layer of the skin?

    <p>Dense (fibrous) connective tissue (D)</p> Signup and view all the answers

    Where are mucous membranes typically located?

    <p>In all body cavities that open to the exterior. (C)</p> Signup and view all the answers

    Which type of membrane is classified under connective tissue membranes?

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

    What substances are produced by eccrine glands?

    <p>Water, salts, vitamin C, and traces of metabolic waste (C)</p> Signup and view all the answers

    Where do apocrine glands empty their ducts?

    <p>Into hair follicles in specific body areas (D)</p> Signup and view all the answers

    At what stage of life do apocrine glands begin to function?

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

    What is the primary role of eccrine glands?

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

    What type of sweat is released by apocrine glands?

    <p>Milky or yellowish in color containing fatty acids and proteins (D)</p> Signup and view all the answers

    What is the outermost layer of hair called?

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

    What provides pigment for hair color?

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

    What is the primary structure where hair grows?

    <p>Hair matrix in the hair bulb (D)</p> Signup and view all the answers

    What role does the integumentary system play in protecting against mechanical damage?

    <p>It contains keratin that toughens skin cells. (D)</p> Signup and view all the answers

    How does the integumentary system aid in thermoregulation?

    <p>By activating sweat glands and increasing blood flow to the skin. (B)</p> Signup and view all the answers

    Which of the following is a way the integumentary system protects against microbial damage?

    <p>By creating an acidic environment that inhibits microbial growth. (D)</p> Signup and view all the answers

    What is one function of the integumentary system related to waste excretion?

    <p>It aids in the release of urea and salts through sweat. (A)</p> Signup and view all the answers

    Which component of the integumentary system helps to produce vitamin D?

    <p>Skin cells exposed to UV radiation. (B)</p> Signup and view all the answers

    What substance produced by melanocytes serves to protect against UV damage?

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

    What helps in preventing desiccation in the integumentary system?

    <p>Keratin and glycolipids. (A)</p> Signup and view all the answers

    Which does the integumentary system NOT do?

    <p>Synthesize hormones directly. (D)</p> Signup and view all the answers

    Flashcards

    Stratum lucidum

    A layer of skin found only in thick, hairless areas like palms and soles.

    Stratum corneum

    The outermost layer of the epidermis with dead, keratin-filled cells.

    Melanin

    A pigment produced by melanocytes that gives color to skin.

    Epidermal dendritic cells

    Cells that alert immune response to bacterial or viral threats.

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    Merkel cells

    Cells that function as touch receptors in association with nerve endings.

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    Papillary layer

    Upper region of the dermis made of areolar connective tissue.

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    Reticular layer

    The deepest skin layer composed of dense irregular connective tissue.

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    Dermal papillae

    Projections in the papillary layer that enhance grip and contain receptors.

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    Layers of the Dermis

    The dermis consists of two main layers that support skin structure.

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    Skin Color Pigments

    Three pigments: melanin, carotene, hemoglobin, determine skin color.

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    Erythema

    Redness of the skin caused by embarrassment, inflammation, or fever.

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    Sebaceous Glands

    Oil glands producing sebum to keep skin soft and moist, activated by androgens.

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    Sweat Glands

    Also known as sudoriferous glands, they produce sweat to regulate temperature.

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    Eccrine Glands

    A type of sweat gland that is widely distributed and helps in temperature regulation.

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    Cutaneous Sensory Receptors

    Receptors in the skin that allow sensation of touch, temperature, and pain.

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    Functions of the Integumentary System

    Refers to the roles the skin plays such as protection and temperature regulation.

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    Protection from Mechanical Damage

    The skin acts as a barrier against bumps; keratin toughens cells and fat cushions impacts.

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    Chemical Damage Protection

    The skin's keratinized cells prevent acids and bases from penetrating deeper.

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    Microbe Damage Defense

    The skin inhibits microbes through its acidic secretions and unbroken surface.

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    UV Radiation Protection

    Melanin produced by melanocytes protects skin from harmful UV rays.

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    Thermal Damage Response

    Skin contains receptors for heat and cold, protecting from temperature extremes.

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    Regulates Heat Loss

    Skin helps regulate body temperature by activating sweat glands and adjusting blood flow.

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    Mini-Excretory System

    The skin excretes urea, salts, and water through sweat.

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    Apocrine glands

    Sweat glands that empty into hair follicles, starting at puberty.

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    Function of eccrine glands

    They produce acidic sweat for body temperature regulation.

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    Composition of eccrine sweat

    Contains water, salts, vitamin C, and metabolic waste.

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    Function of apocrine glands

    Release sweat with fatty acids and proteins, contributing minimally to temperature regulation.

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    Hair follicle

    Structure where hair grows, enclosing the hair root.

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    Components of hair

    Hair consists of a central medulla, cortex, and outer cuticle.

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    Role of melanocytes in hair

    Cells that provide pigment for hair color.

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    Functions of Body Membranes

    Cover body surfaces, line cavities, and protect organs.

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    Epithelial Membranes

    Membranes that consist of epithelial and connective tissue layers.

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    Types of Epithelial Membranes

    Includes cutaneous, mucous, and serous membranes.

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    Cutaneous Membrane

    The outer skin; a dry membrane providing protection.

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    Epidermis

    Outermost layer of the skin made of keratinized cells.

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    Mucous Membranes

    Moist membranes lining cavities that open to the outside.

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    Secretion in Mucous Membranes

    Some mucosae secrete lubricating mucus for protection.

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    Lamina Propria

    Loose connective tissue that supports epithelial layers in mucosae.

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    Arrector Pili Muscle

    A small muscle connected to hair follicles that pulls hairs upright during cold or fright.

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    Nails

    Heavily keratinized, scalelike modifications of the epidermis with growth from the nail matrix.

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    Stratum Basale

    The deepest layer of the epidermis that extends beneath the nail bed and is responsible for nail growth.

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    Free Edge of Nail

    The part of the nail that extends beyond the fingertip and is not attached to the nail bed.

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    Cold Sores

    Blisters caused by human herpesvirus 1, characterized by itching and stinging.

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    Athlete’s Foot

    A fungal infection (Tinea pedis) causing itchy, red peeling skin between the toes.

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    Carbuncles

    Clusters of boils caused by inflammation of hair follicles, often bacterial in origin.

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    Study Notes

    Human Anatomy & Physiology - Chapter 4

    • Body membranes cover body surfaces, line body cavities, and form protective sheets around organs. They are classified by tissue types.

    Epithelial Membranes

    • Epithelial membranes are simple organs, also called covering and lining membranes.
    • They consist of an epithelial tissue layer and a connective tissue layer.
    • Cutaneous membrane is skin, the outermost protective boundary.
      • Consists of two layers:
        • Epidermis: keratinized stratified squamous epithelium
        • Dermis: mostly dense (fibrous) connective tissue
    • Mucous membranes (mucosae) are moist membranes.
      • Some mucosae secrete protective, lubricating mucus.
      • Line body cavities opening to the exterior.
      • Adapted for absorption or secretion.
      • Consist of two layers:
        • Epithelium type depends on site
        • Loose connective tissue (lamina propria)
    • Serous membranes (serosae) line closed ventral body cavities.
      • Occur in pairs, separated by serous fluid.
      • Consist of two layers:
        • Simple squamous epithelium
        • Areolar connective tissue
      • Specific serous membranes include:
        • Peritoneum: covers organs in the abdominal cavity
        • Pleurae: surround the lungs
        • Pericardia: surround the heart

    Connective Tissue Membranes

    • Synovial membranes are composed of loose areolar connective tissue only (no epithelial tissue).
    • They line fibrous capsules surrounding joints, bursae, and tendon sheaths.
    • They secrete a lubricating fluid to cushion organs during movement.

    Integumentary System

    • Consists of skin and skin appendages:
      • Sweat glands
      • Oil glands
      • Hair
      • Nails

    Functions of the Integumentary System

    • Insulates and cushions deeper body organs
    • Protects the body from:
      • Mechanical damage (bumps, cuts)
      • Chemical damage (acids, bases)
      • Thermal damage (heat, cold)
      • Ultraviolet (UV) radiation
      • Microbes
      • Water loss
    • Regulates heat loss through nervous system control.
    • Acts as a mini-excretory system, aiding in the loss of urea, salts, and water.
    • Synthesizes vitamin D.
    • Secretion of a protective acid mantle.

    Structure of the Skin

    • Two main tissue types:
      • Epidermis: outer layer, composed of stratified squamous epithelium.
        • Most cells are keratinocytes that produce keratin (a fibrous protein).
        • Keratinization makes the epidermis tough.
        • Desmosomes connect keratinocytes together.
        • Avascular.
        • Five layers (strata)
          • Stratum basale, Stratum spinosum, Stratum granulosum, Stratum lucidum, Stratum corneum
          • Stratum basale is deepest layer; cells actively divide, pushing daughter cells upwards.
          • Stratum corneum is outermost layer; shingle-like dead cells filled with keratin.
      • Dermis: connective tissue under the epidermis
        • Two regions: papillary layer (upper) and reticular layer (lower)
          • Papillary layer: areolar connective tissue; contains capillary loops and touch receptors. Finger prints!
          • Reticular layer: dense irregular connective tissue, blood vessels, sweat & oil glands, deep pressure receptors.
      • Subcutaneous tissue (hypodermis) anchors skin to underlying organs and serves as a shock absorber.

    Skin Color

    • Three pigments contribute to skin color:
      • Melanin (yellow, reddish brown, or black) produced by melanocytes mostly in stratum basale of the epidermis.
      • Carotene (orange-yellow) found in vegetables.
      • Hemoglobin (red) from blood cells in dermal capillaries; oxygen content influences red coloring.

    Homeostatic Imbalances of Skin

    • Infections and allergies
      • Athlete's foot
      • Boils
      • Cold sores
      • Contact dermatitis
      • Impetigo
      • Psoriasis
    • Burns
      • First-degree: epidermis damaged
      • Second-degree: epidermis and superficial dermis damaged
      • Third-degree: full-thickness burn, destroys epidermis and dermis, burned area painless, requires skin grafts.
      • Fourth-degree: extends into deeper tissues like bone, muscle, etc; dry leathery appearance, surgical intervention required, often amputation.
      • Rule of Nines for burn estimation.
    • Skin cancer (most common cancer type)
      • Main types:
        • Basal cell carcinoma: least malignant, most common
        • Squamous cell carcinoma: believed to be induced by UV exposure.
        • Malignant melanoma: most deadly, cancer of melanocytes; ABCDE rule to detect.

    Developmental Aspects of Skin and Body Membranes

    • Lanugo: downy hair covering the fetus.
    • Vernix caseosa: oily covering present at birth; often disappears within a few weeks.
    • Milia: small white spots present at birth; usually disappears by the third week.
    • Acne is more common during adolescence.
    • Aging skin is affected by skin cancer, thinning, loss of elasticity and graying or balding.

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