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Anatomy & Physiology: Human Body Orientation and Systems

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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 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, cellular, tissue, organ, organ system, organism.

  • What is anatomical variation and why is it important?

    Anatomical variation refers to differences in body structures among individuals. It is important because textbooks show a 'standard' body, but variations can affect medical procedures and diagnoses.

  • Name the five major functions of the integumentary, skeletal, and muscular systems.

    Protection, support, movement, temperature regulation, and mineral storage.

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

    Nervous system: rapid electrical communication and body coordination.

    Endocrine system: slower chemical communication using hormones.

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

    Circulatory (cardiovascular) system transports materials through the body.

    Lymphatic and immune systems provide immunity and transport lymph.

  • What are the main functions of the respiratory, digestive, and urinary systems?

    Respiratory: exchange of oxygen and carbon dioxide.

    Digestive: obtain nutrients and energy from food.

    Urinary: remove waste and excess water from blood.

  • Define homeostasis.

    Maintenance of a stable internal environment within narrow limits despite external changes.

  • What is the difference between negative and positive feedback loops?

    Negative feedback opposes the original stimulus to maintain homeostasis.

    Positive feedback amplifies the original stimulus, moving the system away from the set point.

  • Give an example of a negative feedback loop in the human body.

    Thermoregulation: When body temperature rises, sweating cools the body; when it falls, shivering generates heat.

  • Give an example of a positive feedback loop in the human body.

    Labor contractions: Oxytocin release causes contractions, which increase pressure on the cervix, stimulating more oxytocin release until delivery.

  • What is the anatomical position and why is it important?

    Body upright, face forward, feet shoulder-width apart, palms facing forward. It provides a standard reference for anatomical terminology.

  • Define the directional terms: superior, inferior, anterior, posterior, medial, lateral, proximal, and distal.

    Superior: toward the head; Inferior: toward the feet; Anterior: front; Posterior: back; Medial: toward midline; Lateral: away from midline; Proximal: near limb attachment; Distal: far from limb attachment.

  • What are the three main anatomical planes?

    Frontal (coronal): divides front and back.

    Sagittal: divides left and right.

    Transverse (horizontal): divides top and bottom.

  • What are the major body cavities and what organs do they contain?

    Posterior (dorsal) cavity: cranial cavity (brain) and vertebral cavity (spinal cord).

    Anterior (ventral) cavity: thoracic cavity (heart, lungs), abdominopelvic cavity (digestive organs, kidneys, bladder, reproductive organs).

  • What are serous membranes and their function?

    Double-layered membranes lining body cavities and covering organs; they secrete serous fluid to reduce friction during organ movement.

  • Name the serous membranes associated with the lungs, heart, and abdominal organs.

    Pleurae surround the lungs.

    Pericardium surrounds the heart.

    Peritoneum surrounds most abdominal organs.

  • What is the function of the diaphragm in body cavity organization?

    The diaphragm separates the thoracic cavity (above) from the abdominopelvic cavity (below).

  • What is the significance of the abdominopelvic quadrants and regions?

    They provide a standardized way to describe locations of organs and pain in the abdomen and pelvis for diagnosis and treatment.