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The Human Body: An Orientation Ch1Learning Goals:• An overview of A & P
1. Define anatomy & physiology.2. Explain how anatomy & physiology are related.
• Levels of structure & organization3. Name the levels of structural organization that make up the human body
and explain how they are related.4. Name the organ systems of the body and briefly state the major functions
of each system.5. Classify by organ system all organs discussed.6. Identify the organs shown on a diagram or a dissectible torso.
• Maintaining life7. Define homeostasis and explain its importance.8. Define negative feedback and describe its role in maintaining
homeostasis and normal body function.
• The language of anatomy9. Describe the anatomical position verbally or demonstrate it.10. Use proper anatomical terminology to describe body directions,
surfaces, and body planes.11. Locate the major body cavities and list the chief organs in each cavity.
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An Overview of Anatomy & PhysiologyAnatomy – study of structure; identification of body parts
Physiology – the study of function; how the body parts work
Structure is related to function. Things work the way they work because of their structure.
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Levels of Structural Organization
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Organ System Overview
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Integumentary SystemSkin• Waterproofs, cushions & protects
deeper tissues• Excretes salts & urea• Helps regulate temp• Contains sense receptors (temp,
pressure, pain)
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Skeletal System
• Consists of bone, cartilage, ligaments & joints
• Support• Provides framework for skeletal
muscles for movement• Protection• Produces blood cells
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Muscular System
• Contract to cause movement
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Nervous System
• Fast acting control system• Consists of brain, spinal cord,
nerves & sensory receptors (eyes, ears…)
• Responds to external & internal stimuli
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Endocrine System
• Slower acting control system
• Consists of endocrine glands that produce hormones (chemical messengers) that regulate other structures
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Cardiovascular System
• Transports chemicals through body
• Consists of heart, blood vessels & blood
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Lymphatic System
• Return fluid back to blood vessels that has leaked out
• Involved in immunity• Lymphatic vessels, lymph
nodes, spleen, tonsils
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Respiratory System
• Supply oxygen & remove carbon dioxide (gas exchange)
• Consists of nasal passages, pharynx, larynx, trachea, bronchi & lungs
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Digestive System
• Breaks down food & deliver the small food molecules to the blood for dispersal to the body.
• Consists of oral cavity, esophagus, stomach, small & large intestines.
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Urinary System
• Aka Excretory System• Removes nitrogen -
containing wastes (urea & uric acid)
• Consists of kidneys, ureters, bladder & urethra
• Maintains water, salt & pH balance of blood
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Reproductive System
• Produce offspring• Consists of scrotum, penis
& duct system in males• Uterine tubes, uterus,
vagina in females
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Maintaining LifeNecessary Life Functions• Maintain boundaries• Move• Respond to environmental changes (responsiveness or
irritability)• Take in & digest nutrients• Carry out metabolism (chemical rx)• Dispose of wastes• Reproduce• Grow
All the organ systems work together to enable these to occur.How can you remember these? Picture yourself walking to
McDonalds, eating a Big Mac…
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Survival Needs• Nutrients – used for energy &
cell building• Oxygen – enables us to release
energy from our food• Water – provides fluid base for
body• Body temperature – must be
maintained @ 37 degrees C (98 F)
• Atmospheric pressure (force exerted on surface of body by the weight of air) – breathing depends on appropriate pressure
All of these must be present in appropriate amounts for survival.
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Homeostasis• The bodies ability to
maintain relatively stable internal conditions, regardless of outside conditions.
• Homeo = unchanging• Stasis = standing still• Internal conditions aren’t
still, but they vary within very narrow limits
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The thermostat in your house maintains a set temperature.
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Now… apply this the human body & how it maintains a steady level (amount) of glucose in
the blood.
• Negative feedback – a stimulus causes a response in the opposite direction of the stimulus.
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http://www.youtube.com/watch?v=1oBquWer8R8
• Above link to Mr. Ford’s Body Position video• The correct anatomical position is standing up (erect)
with the feet parallel and the arms hanging at the sides with the palms facing forward and the thumbs pointing away from the body. Body Landmarks
• To precisely point out the chief complaint of a patient, the nurse or physician uses anatomical terms representing a certain body part. For example, a patient walks in the emergency room with a hacking wound on the posterior portion of the left lower leg. To clearly state the area of injury the nurse uses the term “sural” which means the posterior surface of the lower leg rather than writing “back area of the lower leg”. Knowing these terms not only give the nurse a more accurate formulation of chief complaints but it also saves time of a good deal of description.
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Anatomical Position
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Orientation & Directional TermsUsed to clearly explain the relation of one body structure to
another
• Superior – above• Inferior – below• Anterior – in front of• Posterior – behind• Medial – middle• Lateral – away from the middle; at outer the sides• Intermediate – between a more medial and a more a
lateral surface• Proximal – close to the body part• Distal – away from a body part• Superficial – external; at the surface• Deep – internal; away from the surface
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Orientation & Directional Terms
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Regional Terms
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Anterior Body Landmarks
• Abdominal – anterior body trunk inferior to ribs• Acromial – point of shoulder• Antecubital – anterior surface of elbow• Axillary – armpit• Brachial – arm• Buccal – cheek area• Carpal – wrist• Cervical – neck region• Coxal – hip• Crural – leg• Digital – fingers, toes• Femoral – thigh• Fibular – lateral part of the leg• Inguinal – area where thigh meets body part• Nasal – nose area• Oral – mouth• Orbital – eye area• Patellar – anterior knee• Pelvic – area overlying the pelvis anteriorly• Pubic – genital region• Sternal – breastbone area• Tarsal – ankle region• Thoracic – chest• Umbilical – navel
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Posterior Body Landmark
• Calcaneal – heel of foot• Cephalic – head• Deltoid – curve of shoulder formed
by large deltoid muscle• Femoral – thigh• Gluteal – buttock• Lumbar – area of back between
ribs and hips• Occipital – posterior surface of
head• Olecranal – posterior surface of
elbow• Popliteal – sacral• Scapular – shoulder blade region• Sural – posterior surface of the
lower leg• Vertebral – area of spine• Plantar – sole of the foot
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Body Planes & Sections
Median Frontal or Coronal
Transverse
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Body CavitiesLateral View
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Body CavitiesAnterior View
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Abdominopelvic Cavity Regions
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Adominopelvic Cavity Quadrants
View without skeleton
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Interactive Region Body Parts Site
• http://www.wisc-online.com/objects/ViewObject.aspx?ID=AP14904
• http://nhscience.lonestar.edu/biol/dropdrag/regions1.htm
Flash Cards of Body Regionshttp://quizlet.com/11406/anatomy-regional-terms-flash-cards/
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Body Organization Quiz / Games
• http://msjensen.cehd.umn.edu/webanatomy/timed/01.htm