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Anatomy & Physiology: Skin, Tissue, and Cell Structure

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  • What are the three main layers of the skin?

    The epidermis, dermis, and hypodermis (subcutaneous layer).

  • What type of tissue primarily composes the epidermis?

    Stratified squamous epithelium, mainly keratinized to protect against abrasion.

  • What is the function of melanocytes in the skin?

    They produce melanin, which protects against UV radiation and gives skin its color.

  • Name the main structural protein found in the epidermis.

    Keratin, which provides strength and waterproofing.

  • What are the primary components of the dermis?

    Collagen and elastin fibers, blood vessels, nerves, hair follicles, and glands.

  • What type of connective tissue is found in the hypodermis?

    Loose connective tissue and adipose tissue for insulation and cushioning.

  • What is the role of Langerhans cells in the skin?

    They act as immune cells that detect and present antigens to the immune system.

  • Describe the structure of a hair follicle.

    A tubular invagination of the epidermis into the dermis that produces hair shafts.

  • What are the two main types of sweat glands?

    Eccrine glands for thermoregulation and apocrine glands associated with hair follicles.

  • What is the function of sebaceous glands?

    They secrete sebum, an oily substance that lubricates and waterproofs the skin and hair.

  • What is the difference between squamous cell carcinoma and basal cell carcinoma?

    Squamous cell carcinoma arises from keratinocytes in the epidermis, basal cell carcinoma from basal cells in the epidermis.

  • What is the primary function of epithelial tissue?

    To cover surfaces and form protective barriers.

  • Name the four basic tissue types in the human body.

    Epithelial, connective, muscle, and nervous tissue.

  • What distinguishes connective tissue from epithelial tissue?

    Connective tissue has extracellular matrix and supports other tissues; epithelial tissue covers surfaces and has little matrix.

  • What is the role of collagen fibers in connective tissue?

    They provide strength and structural support.

  • What type of muscle tissue is found in the heart?

    Cardiac muscle, which is striated and involuntary.

  • What is the function of nervous tissue?

    To transmit electrical signals for communication within the body.

  • What are the main components of blood as a connective tissue?

    Cells (red and white blood cells) and plasma (fluid matrix).

  • What is the function of adipose tissue?

    To store energy, provide insulation, and cushion organs.

  • What is the significance of the basement membrane in epithelial tissue?

    It anchors the epithelium to underlying connective tissue and acts as a selective barrier.