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Anatomy & Physiology: Human Body Orientation, Tissue, and Integumentary System

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Termini in questo insieme (29)

  • What is homeostasis and why is it important?

    Homeostasis is the body's ability to maintain a stable internal environment. It is important because it ensures optimal conditions for cellular function and overall health.

  • Explain negative feedback with an example.

    Negative feedback reverses a change to maintain homeostasis. Example: body temperature regulation where sweating cools the body when it is too hot.

  • Explain positive feedback with an example.

    Positive feedback amplifies a change. Example: during childbirth, oxytocin release intensifies contractions until delivery.

  • Role of receptor, control center, and effector in feedback loops

    Receptor detects change, control center processes information, and effector produces response to restore balance.

  • What is homeostatic imbalance? Give an example.

    Homeostatic imbalance occurs when the body cannot maintain stable conditions, leading to disease. Example: diabetes from blood sugar regulation failure.

  • List the necessary life functions.

    Maintaining boundaries, movement, responsiveness, digestion, metabolism, excretion, reproduction, and growth.

  • Difference between anatomy and physiology

    Anatomy studies body structure; physiology studies body function.

  • Where is epithelial tissue generally found?

    Epithelial tissue covers body surfaces, lines cavities, and forms glands.

  • Special characteristics of epithelial tissue

    Polarity, specialized contacts, supported by connective tissue, avascular but innervated, and high regeneration capacity.

  • What is a goblet cell and where is it located?

    Goblet cells are mucus-secreting epithelial cells found in respiratory and digestive tracts.

  • Common characteristics of connective tissue

    Cells separated by abundant extracellular matrix, varying vascularity, and functions including support and protection.

  • What is extracellular matrix?

    The non-cellular component of connective tissue made of ground substance and protein fibers providing structural support.

  • Three types of connective tissue fibers and their functions

    Collagen fibers provide strength, elastic fibers allow stretch, reticular fibers form supportive networks.

  • Types of cells in connective tissue and their roles

    Fibroblasts produce fibers, macrophages engulf debris, mast cells mediate inflammation, adipocytes store fat.

  • Functions of muscle tissue

    Muscle tissue enables movement, maintains posture, and generates heat.

  • Defining characteristics of skeletal muscle

    Located attached to bones, voluntary control, striated, multinucleated cells.

  • Defining characteristics of cardiac muscle

    Found in heart walls, involuntary control, striated, single nucleus, intercalated discs.

  • Defining characteristics of smooth muscle

    Located in walls of hollow organs, involuntary control, non-striated, single nucleus.

  • Function of nervous tissue

    Transmit electrical signals to coordinate body functions.

  • What tissue type makes up the epidermis and its function?

    Keratinized stratified squamous epithelium forms the epidermis, providing protection against abrasion and water loss.

  • Cell types in the epidermis and their functions

    Keratocytes produce keratin, melanocytes produce pigment, Langerhans cells provide immune defense, Merkel cells detect touch.

  • Layers of the epidermis in order

    From deep to superficial: stratum basale, stratum spinosum, stratum granulosum, stratum lucidum (only in thick skin), stratum corneum.

  • What is keratin and its function?

    Keratin is a tough, fibrous protein that protects skin cells and makes the skin waterproof.

  • Difference between thin and thick skin

    Thick skin has five epidermal layers and is found on palms and soles; thin skin has four layers and covers the rest of the body.

  • Function and components of the dermis

    The dermis supports and nourishes the epidermis; it contains connective tissue, blood vessels, nerves, hair follicles, and glands.

  • Two layers of the dermis

    Papillary layer (areolar connective tissue) and reticular layer (dense irregular connective tissue).

  • What are cleavage (tension) lines and their importance?

    Lines in the dermis indicating collagen fiber orientation; important for surgical incisions to heal with less scarring.

  • Three pigments determining skin color

    Melanin, carotene, and hemoglobin.

  • What triggers sebaceous gland secretion and its function?

    Sebaceous glands produce sebum triggered by hormones; sebum lubricates and waterproofs skin and hair.