Integumentary System Chapter 5
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Questions and Answers

What is one of the primary functions of melanocytes?

  • Transmitting nerve signals
  • Storing fat in the body
  • Producing collagen and elastic fibers
  • Adding color to the skin (correct)

    • Which layer of the skin is responsible for producing fingerprints?

  • Papillary Layer (correct)
  • Reticular Layer
  • Hypodermis
  • Epidermis

    • What is the primary function of melanin in the skin?

  • To provide color to the hair and eyes (correct)
  • To protect against UV light (correct)
  • To facilitate the production of sebum
  • To generate heat in the skin

    • What is a characteristic feature of albinism?

    <p>Absence of melanin</p> Signup and view all the answers

    What is the main characteristic of the reticular layer of the skin?

    <p>It is the deepest layer, comprising 80% of the dermis</p> Signup and view all the answers

    Which skin color condition is associated with liver disorders?

    <p>Jaundice</p> Signup and view all the answers

    Which statement about the hypodermis is true?

    <p>It acts as a shock absorber and insulates deeper tissues</p> Signup and view all the answers

    How is skin color primarily determined?

    <p>Through genetics, blood circulation, and pigments</p> Signup and view all the answers

    Which type of gland is responsible for secreting sebum?

    <p>Sebaceous glands</p> Signup and view all the answers

    What skin condition results from exposure to UV radiation and leads to clumping of elastic fibers?

    <p>Sunburn</p> Signup and view all the answers

    What is the primary function of the cuticle in hair structure?

    <p>It protects the cortex.</p> Signup and view all the answers

    Which factor contributes positively to hair growth?

    <p>Testosterone</p> Signup and view all the answers

    What is the correct order of the hair regions from outermost to innermost?

    <p>Cuticle, Cortex, Medulla</p> Signup and view all the answers

    What is the primary composition of nails?

    <p>Layers of dead stratum corneum cells</p> Signup and view all the answers

    Which component is responsible for nail growth?

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

    What is the primary function of the stratum corneum in the epidermis?

    <p>Waterproofing the skin</p> Signup and view all the answers

    Which layer of the epidermis is primarily responsible for cell division and the production of new cells?

    <p>Stratum Basale</p> Signup and view all the answers

    What is keratinization?

    <p>The process in which cells push old cells to the surface while accumulating keratin</p> Signup and view all the answers

    Which component is NOT a function of the integumentary system?

    <p>Production of heat</p> Signup and view all the answers

    Which layer of the epidermis is found only in thick skin, such as the palms and soles?

    <p>Stratum Lucidum</p> Signup and view all the answers

    What is the primary effect of active vitamin D in the body?

    <p>It prompts the intestine to absorb calcium and phosphate.</p> Signup and view all the answers

    Which physiological response occurs when the body needs to cool down?

    <p>Sweat production increases and blood vessels dilate.</p> Signup and view all the answers

    What is a characteristic of a 1st degree burn?

    <p>It results in redness, slight swelling, and heals within 2-3 days.</p> Signup and view all the answers

    How does aging affect skin structure?

    <p>It results in decreased blood flow and thinner skin.</p> Signup and view all the answers

    What occurs to the precursor of vitamin D after it is produced in the skin?

    <p>It is carried by blood to the liver for further modification.</p> Signup and view all the answers

    What is a critical factor for determining if burns are severe?

    <p>Presence of burns affecting the airway</p> Signup and view all the answers

    Which type of burn extends into deeper tissues such as muscles and bones?

    <p>Fourth degree burns</p> Signup and view all the answers

    What commonly causes Carbuncles?

    <p>Bacterial infections</p> Signup and view all the answers

    Which skin condition is characterized by reddened lesions covered with dry, silvery scales?

    <p>Psoriasis</p> Signup and view all the answers

    What primarily causes skin cancer?

    <p>UV light exposure</p> Signup and view all the answers

    Which part of the hair is responsible for growth and is located within the follicle?

    <p>Root</p> Signup and view all the answers

    What is one of the protective functions of hair?

    <p>Shielding the eyes</p> Signup and view all the answers

    What structure forms the base of the hair and is involved in the production of hair?

    <p>Bulb</p> Signup and view all the answers

    Hair is primarily found all over the body except in which of the following areas?

    <p>Hands</p> Signup and view all the answers

    How does hair contribute to attracting sexual partners?

    <p>By its appearance and presence</p> Signup and view all the answers

    What distinguishes Malignant Melanoma from other skin cancers?

    <p>It arises from melanocytes in a mole.</p> Signup and view all the answers

    Which of the following characteristics is NOT part of the ABCDE rule for identifying Melanoma?

    <p>Depth</p> Signup and view all the answers

    Which type of skin cancer has the potential to cause death?

    <p>Squamous Cell Carcinoma</p> Signup and view all the answers

    What is Vernix Caseosa primarily composed of?

    <p>Lipids and proteins</p> Signup and view all the answers

    What is the primary function of Lanugo?

    <p>To protect the skin of the fetus.</p> Signup and view all the answers

    Study Notes

    Integumentary System Overview

    • Integument refers to the body's covering, primarily the skin.
    • Major components include skin, hair, nails, and glands.

    Functions of the Integumentary System

    • Protection: Prevents water loss and shields against microbes and UV light.
    • Sensation: Detects hot, cold, pain, and pressure.
    • Temperature Regulation: Maintains homeostasis through blood flow and sweat production.
    • Excretion: Eliminates waste materials.
    • Vitamin D Production: UV light aids in the synthesis of vitamin D in the skin.

    Epidermis

    • The outermost skin layer composed of stratified squamous epithelium.
    • Keratinization process occurs, taking 40-56 days for cells to reach the surface.

    Layers of the Epidermis

    • Stratum Basale: Deepest single cell layer, undergoes frequent division.
    • Stratum Spinosum: Spiky appearance due to desmosomes; involved in cell division.
    • Stratum Granulosum: Contains waterproofing granules; cells start to die near the upper border.
    • Stratum Lucidum: Thin, translucent layer found in thick skin (e.g., palms, soles).
    • Stratum Corneum: Outermost layer with 20-30 dead keratin-filled cells; major contributor to epidermal thickness.

    Dermis

    • Second skin region composed of dense connective tissue; supports and protects underlying structures.
    • Contains collagen, elastic fibers, nerve endings, blood vessels, and hair follicles.

    Dermal Layers

    • Papillary Layer: Contains dermal papillae; involved in nutrient supply and heat radiation; houses Meissner's Corpuscles for light touch.
    • Reticular Layer: Deepest dermis layer; accounts for 80% of dermis structure; contains blood vessels and pressure receptors.

    Hypodermis (Subcutaneous Tissue)

    • Technically not part of the skin; contains loose and adipose tissue.
    • Acts as a shock absorber and insulates deeper structures; stores about 50% of body fat.

    Skin Color and Factors

    • Skin color is influenced by pigments, genetics, blood circulation, and thickness of stratum corneum.
    • All humans have similar amounts of melanocytes; darker skin produces more melanin in response to UV exposure.

    Skin Pigments

    • Melanin: Primary pigment, offering UV protection and responsible for hair/eye color.
    • Carotene: Yellow-orange pigment from plants, accumulates in stratum corneum.
    • Hemoglobin: Causes the pinkish-red hue in skin due to red blood cells.

    Tanning and Damage

    • UV exposure increases melanin production resulting in tanning and protects against further UV damage.
    • Excessive UV can lead to skin structure damage and mutations leading to cancer.

    Skin Color Abnormalities

    • Erythema: Redness due to increased blood flow.
    • Pallor: Pale skin indicative of anemia or low blood pressure.
    • Jaundice: Yellowing indicating liver issues.
    • Cyanosis: Bluish skin due to low oxygen levels.

    Appendages of the Skin

    • Include cutaneous glands, hair, hair follicles, and nails.

    Cutaneous Glands

    • Sebaceous Glands: Produce sebum to lubricate skin and hair; absent on palms and soles.

    Hair Structure and Function

    • Hair consists of root (follicle-embedded) and shaft (externally visible).
    • Composed of medulla, cortex, and cuticle layers; serves to protect and filter.

    Nails

    • Composed of hard keratin; structure includes nail body, root, folds, bed, matrix, and cuticle.
    • Nail growth originates from the nail matrix.

    Vitamin D Synthesis

    • Triggered by UV light, modifies a precursor into active vitamin D crucial for calcium/phosphate absorption.

    Aging Effects on Integument

    • Reduced blood flow and collagen leads to thinner skin, sagging, and increased difficulty in temperature regulation.

    Classification of Burns

    • 1st Degree: Superficial, affects only epidermis; heals in 2-3 days.
    • 2nd Degree: Affects epidermis and upper dermis with blisters.
    • 3rd Degree: Destroys parts of epidermis and dermis; can be painful.
    • 4th Degree: Extends into deeper tissues; may require amputation.

    Skin Disorders

    • Infections include athlete's foot, boils, and impetigo.
    • Conditions like psoriasis involve chronic inflammation and scaling of the skin.

    Skin Cancer Types

    • Basal Cell Carcinoma: Common, arises from stratum basale; usually treatable.
    • Squamous Cell Carcinoma: Can be lethal; affects cells above stratum basale.
    • Melanoma: Dangerous cancer from melanocytes; follow ABCDE rule for evaluation.

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    Description

    Dive into the fascinating world of the integumentary system with this quiz based on Chapter 5. Discover the components, functions, and interesting facts about our skin, the body's largest organ. Test your knowledge about skin protection, sensation, and more!

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