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Anatomy & Physiology: Chapter 1 - The Human Body: An Orientation

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  • What is the difference between anatomy and physiology?

    Anatomy is the study of the body’s structure.

    Physiology is the study of the body’s function.

  • What is the principle of complementarity of structure and function?

    Structure exists to perform a function; to understand why an organ is shaped a certain way, you must understand what it does. Function is determined by structure; to understand how an organ performs its job, you must understand how it is built.

  • List the levels of organization in the human body from smallest to largest.

    Atomic and molecular level, cellular level, tissue level, organ level, organ system level, organism level.

  • What is anatomical variation and why is it important?

    Anatomical variation refers to differences in the arrangement or structure of body parts among individuals. It is important because textbooks show a reference body, but variations can affect medical procedures and diagnoses.

  • Name the five organ systems involved in protection, support, and movement.

    Integumentary system, skeletal system, muscular system.

  • What are the main functions of the nervous and endocrine systems?

    The nervous system provides rapid electrical communication and body coordination. The endocrine system uses chemical messengers (hormones) for slower, long-term regulation.

  • Which organ systems are primarily responsible for transport and immunity?

    The circulatory (cardiovascular) system transports materials through the body. The lymphatic and immune systems transport lymph and provide immunity.

  • What is homeostasis?

    Homeostasis is the maintenance of a stable internal environment within narrow limits despite external changes.

  • What are negative feedback loops?

    Negative feedback loops oppose the original stimulus to return the system to its set point, maintaining homeostasis. They are the most common feedback mechanism.

  • What are positive feedback loops?

    Positive feedback loops amplify the original stimulus, moving the system further from the set point. They are less common and usually require a 'switch' to stop the loop.

  • Identify the three components of a negative feedback loop.

    1. Receptor: detects change in internal environment.
    2. Control center: processes information and signals a response.
    3. Effector: carries out action to restore set point.

  • What is the anatomical position?

    Body upright, face forward, feet shoulder-width apart, toes pointing forward, arms at sides with palms facing forward. Left and right refer to the body's left and right.

  • Define the directional terms: superior and inferior.

    Superior: toward the head or upper part of a structure.
    Inferior: away from the head or lower part of a structure.

  • Define the directional terms: anterior and posterior.

    Anterior: toward the front of the body.
    Posterior: toward the back of the body.

  • What do the terms medial, lateral, ipsilateral, and contralateral mean?

    Medial: toward the midline.
    Lateral: away from the midline.
    Ipsilateral: on the same side.
    Contralateral: on the opposite side.

  • What is the difference between proximal and distal?

    Proximal: closer to the point of attachment of a limb.
    Distal: farther from the point of attachment.

  • What do superficial and deep mean in anatomical terms?

    Superficial: closer to the surface of the body.
    Deep: farther from the surface of the body.

  • Name the nine abdominopelvic regions.

    Right and left hypochondriac, epigastric, right and left lumbar, umbilical, right and left inguinal (iliac), hypogastric (pubic).

  • What are the three major anatomical planes?

    Frontal (coronal): divides body into anterior and posterior.
    Sagittal: divides body into left and right.
    Transverse (horizontal): divides body into superior and inferior.

  • What are the two main body cavities and what do they contain?

    Posterior (dorsal) cavity: contains the brain and spinal cord.
    Anterior (ventral) cavity: contains thoracic and abdominopelvic cavities housing most organs.

  • What are serous membranes and their function?

    Thin double-layer membranes that line body cavities and cover organs. They produce serous fluid to reduce friction during organ movement.

  • Name the four serous membranes and the cavities they surround.

    Pleurae: surround lungs.
    Pericardium: surrounds heart.
    Peritoneum: surrounds most abdominal organs.