APHY 101 1.1
Overview of Human Anatomy and Physiology
Definition of Anatomy and Physiology:
Anatomy and physiology is the scientific study of the structure of the human body and how it functions.
The human body operates as a microscopic community of cells that are specialized to perform specific and essential responsibilities.
Cells interact to maintain a stable internal environment in which all cells can survive.
Structural Organization Hierarchy:
Cells aggregate and interact to form tissues.
Tissues layer, fold, and intertwine to form organs.
Organs connect to form comprehensive organ systems.
Educational Purpose and Application:
Mastering the language and principles of anatomy and physiology provides insight into personal health, strengths, and physical talents.
Establishes a foundational knowledge base required for healthcare professionals to effectively care for patients.
Chapter Learning Outline Sections:
1.1 Origins of Medical Science
1.2 Anatomy and Physiology
1.3 Levels of Organization
1.4 Core Themes in Anatomy and Physiology
1.5 The Characteristics and Maintenance of Life
1.6 Organization of the Human Body
1.7 Life-Span Changes
1.8 Anatomical Terminology
Anatomical Word Roots and Prefixes
append-: To hang something.Example: Appendicular — pertaining to the upper limbs and lower limbs.
cardi-: Heart.Example: Pericardium — membrane that surrounds the heart.
cerebr-: Brain.Example: Cerebrum — largest part of the brain.
cran-: Helmet.Example: Cranial — pertaining to the portion of the skull that surrounds the brain.
dors-: Back.Example: Dorsal — position toward the back of the body.
homeo-: Same.Example: Homeostasis — maintenance of a stable internal environment.
-logy: The study of.Example: Physiology — study of body functions.
meta-: Change.Example: Metabolism — chemical changes taking place in the body.
nas-: Nose.Example: Nasal — pertaining to the nose.
orb-: Circle.Example: Orbital — pertaining to the portion of the skull that encircles an eye.
pariet-: Wall.Example: Parietal membrane — membrane that lines the wall of a cavity.
pelv-: Basin.Example: Pelvic cavity — basin-shaped cavity enclosed by the pelvic bones.
peri-: Around.Example: Pericardial membrane — membrane that surrounds the heart.
pleur-: Rib.Example: Pleural membrane — membrane that encloses the lungs within the rib cage.
-stasis: Standing still.Example: Homeostasis — maintenance of a stable internal environment.
super-: Above.Example: Superior — referring to a body part located above another.
-tomy: Cutting.Example: Anatomy — study of structure, which often involves cutting or removing body parts.
Origins of Medical Science
Historical Development of Medicine:
Early interest in the structure and function of the body arose primarily from observations of physical malfunctions, injuries (such as broken bones), or general feelings of ill health.
Early healers functioned as the first physicians, initially relying on superstition and magic to administer care.
Care evolved over time into a system of identifying causes for observed symptoms and developing targeted remedies.
The origin of medicine and pharmacology began with the discovery that specific herbs and naturally occurring chemicals could relieve symptoms like coughs, headaches, and fevers.
Historical anatomical study is exemplified by classic works such as the 1543 illustration in the second book of De Humani Corporis Fabrica by Andreas Vesalius, which displayed body positioning similar to the modern standard anatomical position.
Language and Methods of Anatomical Study:
As systematic questioning, precise observation, and experimentation developed, expanding medical knowledge necessitated a specialized medical vocabulary.
Early providers formulated anatomical terms largely derived from Greek and Latin to name structures, indicate locations, and describe biological functions.
In Europe during the Middle Ages, the study of human corpses was strictly forbidden.
By the twentieth century, cadaver dissection became a core component of medical education.
Modern anatomical learning utilizes cadaver dissection, autopsies, instructor-prepared dissections (prosections), and computerized digital scans.
Digital resources for anatomical study include the Visible Human Project from the National Library of Medicine and interactive software programs like Anatomy and Physiology Revealed.
Application of the Scientific Method in Anatomy
Steps of the Scientific Method:
1. Making accurate observations of the natural world.
2. Asking precise questions based on observed phenomena.
3. Formulating a hypothesis, which serves as a testable proposed answer derived from existing knowledge.
4. Testing the hypothesis through experimentation or additional systematic observations.
5. Analyzing test results to either support or reject the hypothesis.
Core Philosophy: Science advances by eliminating incorrect explanations rather than providing immediate total answers.
Practical Example Scenario:
Observation: An individual suffers a painful injury to the arm region located between the wrist and elbow following a classroom lecture on the skeletal system.
Question: What is the source of the severe pain?
Hypothesis: The pain is caused by a broken bone in the forearm.
Testing: An X-ray image is obtained of the affected area.
Conclusion: The X-ray results either support or reject the hypothesis that a bone fracture occurred.
Practice Questions and Core Concepts
Question 1: What factors probably stimulated an early interest in the human body?
Answer: Factors include attempting to understand the causes of various injuries, illnesses, and the loss of function of body parts, as well as attempting to treat these conditions.
Question 2: What types of activities helped promote the development of modern medical science?
Answer: Activities include dissection of cadavers, the production of prosthetic body parts, experimentation to improve medical knowledge and techniques, and the discovery of certain chemicals in nature as treatments for specific conditions.
Question 3: What is the role of a hypothesis in the scientific method?
Answer: The hypothesis is the idea or proposition being evaluated or tested. It is formulated based on observations and tested through experiments.
Career Spotlight: Emergency Medical Technician (EMT)
Emergency Response Clinical Scenario:
A driver swerves to avoid a cat in the road, slams on the brakes, hits a parked car, and strikes her head on the steering wheel.
Onlookers call 911, bringing an emergency vehicle and two EMTs to the scene within minutes.
EMTs assess the patient by taking vital signs. The patient exhibits a forehead laceration and is conscious but confused.
EMTs stabilize the neck with a cervical restraint, transfer the patient onto a backboard, and load her into the ambulance.
While one EMT drives, the other applies direct pressure to the forehead laceration in the rear compartment.
Upon hospital arrival, EMTs document all care rendered, followed by cleaning and restocking the ambulance.
Job Description and Work Environment:
EMTs provide critical care to injured or acutely ill patients in emergency settings and manage non-emergency inter-facility transports (e.g., hospital to nursing home).
Work environments include both indoor and outdoor settings requiring high physical strength and rapid decision-making skills.
Licensure and Training Requirements:
All EMTs must obtain state licensure, with specific requirements varying by state.
Basic EMT Training Duration: Require to hours of formal training.
Paramedic EMT Training Duration: Require to hours of formal training.
Paramedic Scope of Practice: Advanced capabilities relative to basic EMTs include administering injections, establishing intravenous (IV) lines, and administering an expanded range of medications.