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Explore the major themes of human anatomy and physiology, from Hippocrates to modern imaging techniques, and discover the intricacies of the human body’s structure and function. Learn about cellular organization, anatomical variations, and the importance of homeostasis in maintaining physiological balance. Take the learning test at VARK to enhance your learning style.
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But First…How Do You Learn? • Take the learning test at: • http://www.vark-learn.com/ • VARK= Visual, Aural, Read/Write, Kinesthetic (seeing, listening, reading, feeling)
Muscles • Download the muscle chart from Dr. Stouder’s website. • Obtain the audio version on the website • Start learning to pronounce the muscle names correctly. • “The beginning of wisdom is to call things by their right names.” –Chinese proverb
Chapter 1Major Themes of Anatomy & Physiology • ANATOMY- Study of form • PHYSIOLOGY- Study of the function
Anatomy’s History I • Anatomy is as old as civilization • Anatomy gives you a foundation for advanced study in every type of health care, even self-care. • Dissection: We know of the body structure through this process. • Anatomy and dissection both mean “cutting apart” • In human anatomy a cadaver is examined by cutting. • In health care we exam by: palpation, auscultation, percussion.
Anatomy’s History II • Hippocrates- “Father of medicine”, humors caused disease not the gods. • Aristotle: coined the words: physician, physiology and theology. • He thought that gods could cause disease- “theologi” or natural causes- “physiologi” • Galen: wrote the medical textbook of ancient time without the benefit of dissection • Roman anatomists gave anatomy a bad name, dissected prisoners, dissection was banned before Galen • Galen warned that even his own book could be wrong • See page 9 and page 67 in your text book, find the inaccuracy. • Versalius: the Catholic church relaxed the ban on dissection, Versalius found that Galen was wrong • Henry Gray: Improved on Versalius in Gray’s Anatomy
Human Structure • Levels of Structural Organization: • Chemical SIMPLEST • Cellular • Tissue • Organ • System • Organism COMPLEX.
Anatomical Variation. • An anomaly occurs in 30% of the population • No 2 humans are exactly alike (still, they’re close) • Missing organs • palmaris longus muscle • More or less organs than normal • 6 lumbar vertebrae, 5 wisdom teeth • Variation in organ locations (situs inversus, dextrocardia, situs perversus)
Organization Cellular composition cell theory: all structure & function result from the activity of cells Metabolism= Catabolism, Anabolism Responsiveness (nerve impulses) Movement Growth Differentiation= unspecialized to specialized Reproduction Excretion Homeostasis Characteristics of life
Homeostasis: Maintaining Physiological Balance • Hippocrates noted that body normally returns to a state of equilibrium by itself • needs to detect the change & oppose it • Regulation of Homeostasis • FAST= Nervous System (Nerves) • Slow= Endocrine System (Hormones) • Loss of homeostatic control causes illness or death
DISEASE IS HOMEOSTATIC IMBALANCE Don’t treat the disease. Treat the patient who has the disease.
A Word on pH (page 66) • Normal blood pH is 7.35-7.45 • homeostasis keeps blood within this small range • pH is the “Power of Hydrogen” Ions • A hydrogen ion is really just a proton • The pH scale goes from 0-14 • 0-7 is acidic, 7-14 is basic, 7 is neutral • 0-7 means increased hydrogen ions, 7-14 is decreased hydrogen ions, 7 is equal hydrogen ions (H+) and hydroxide ions (OH-)
- NEGATIVE FEEDBACK Effects stimulus in a NEGATIVE way Effects are to DECREASE the stimulus SUBTRACTS FROM Example- High BP, increase BP= decreased BP MOST COMMON + POSITIVE FEEDBACK Effects stimulus in a POSITIVE way Effects are to INCREASE the stimulus ADDS TO Example- Labor , Contractions= more contractions Feedback Systems- Maintaining Homeostasis
Positive Feedback Loops • Physiological change that leads to an even greater change in the same direction (self-amplifying)
Medical Terms • Diagnosis Di-agnosis (di- two, agnosis- don’t know) = two guesses, MAYO clinic 50% incorrect on autopsy • Medical History- 90% of diagnosis • Physical exam, tests- never makes diagnosis, supports diagnosis • Pharmacology- Pharmakon = poison.
Medical Imaging • Radiography • x-rays discovered (William Roentgen) in 1895 • dense tissue (bone, teeth and tumors) are not penetrated so the photographic film remains white • Sonography • high-frequency ultrasound waves echoes back from internal organs, great for fluid imaging • obstetrics uses to locate placenta, evaluate fetal age, position and development
Medical Imaging • Computed Tomography (CT scan) • low-intensity X rays computer analysis produces an image of a slice of the body • Magnetic Resonance Imaging (MRI) • magnetic field aligns atoms; when the magnetic field is turned off the atoms give off energy • computer analysis produces a picture • Best for soft tissue analysis
Medical Imaging • Positron Emission Tomography (PET scan) • detects activity of tissue • injection of radioactively labeled glucose emits energy analyzed by computer • color image of glucose usage at that moment • extent of damaged to heart tissue • activity of brain of neurology patients
Imaging review- In Two Words or… • Radiography • dense tissue • Sonography • fluid imaging • Computed Tomography (CT scan) • slice • Magnetic Resonance Imaging (MRI) • soft tissue • Positron Emission Tomography (PET scan) • tissue activity
Sometimes the whole picture is not seen. 1 2 3 4 5 The Yoke “Tumor” is missed with too wide of a slice (#1 and #5) 1 5 2 3 4
EDITORIAL- Why use medical terms? • Common reason • Ease of description • English is limited anatomically • Underlying reason • Mystique • Secures profession, Idiopathic • Cover inadequacies, Iatrogenic • Aids healing
Atlas AGeneral Orientation to Human Anatomy • Anatomical Position • Directional Terms- relative terms: • As three questions 1. Anterior or Posterior? 2. Superior or Inferior? 3. Medial or Lateral? • Your _____ is ___/___/___ to your _____. • Proximal/distal, Ipsilateral (same side), Bilateral (Both sides, Contralateral (opposite side)
Sagittal plane divides body into right and left halves Gives you a lateral view Coronal (Frontal) plane divides body into front & back portions Gives you an Anterior toPosterior view Transverse (horizontal) plane divides the body into upper & lower portions Gives you a bird’s eye view Oblique plane is a between a sagittal and coronal planes gives an oblique view Planes and Views
Body Cavities • Major body cavities • dorsal body cavity • cranial cavity • vertebral canal • ventral body cavity • thoracic cavity • diaphragm separates them • abdominopelvic cavity • abdominal cavity • pelvic cavity • Lined by membranes • Filled with viscera