Chapter 1 Notes: Overview of Anatomy & Physiology

Chapter 1 - General Information (Notes)

  • Source context: Biology 1121, Anatomy & Physiology, Pearson Education slides (Chapter 1)

  • Course logistics (from Page 2):

    • Class roster, syllabus/course policy, exam testing in class on assigned days; testing center cannot be accommodated; extended time only available before class

    • Textbook choices and lab manual, studying recommendations, questions

  • What is this class about? (Chapter 1)

    • Anatomy + Physiology = Study of the human body

    • Structure (Anatomy) + Function (Physiology)

    • Anatomy: the study of internal and external structures and their physical relationships among other body parts

    • Physiology: the study of how living organisms perform vital functions

  • Essential Concept #1: Principle of Complimentary Structure and Function

    • Function Reflects Structure/Form

    • Examples: car engine design and performance; heart valve/chamber design and blood flow; bones as levers; organelle distribution within a cell

    • Physiology is dependent on (explained by) underlying anatomy

  • Chapter 1 Anatomy Fields

    • Gross Anatomy (macroscopic anatomy): what you can see with the naked eye

    • Surface/Superficial

    • Regional

    • Sectional (cross-sections)

    • Systemic (looks at organ systems)

    • Clinical (includes pathological, radiographic & surgical)

    • Developmental – Embryology

    • Microscopic Anatomy: too small to be seen without assistance (microscope)

    • Cytology (cells) – organelles

    • Histology (tissues) – epithelial, connective, nervous, muscle

  • Physiology Specialties

    • Cell Physiology: functions of cells; chemical processes within cells and chemical interactions among cells

    • Example relationships: melanocytes and keratinocytes; transcription of DNA into amino acids (proteins)

    • Organ physiology: study of specific organs (e.g., heart – cell types, electrical conduction system, valves)

    • Systemic physiology: study of all aspects of specific organ systems (e.g., Cardiovascular system – Heart, Arteries, Veins, Capillaries)

    • Pathological physiology: study of effects of disease; loss of homeostasis

  • Essential Concept #2: Hierarchy of Structural Organization

    • Organization of a single individual

    • Small → Large: Epithelium, Muscle, Nervous, Connective

    • Min. 2 tissues, usually 4 tissue types

    • Made up of Organelles

  • Systemic Approach to Studying Anatomy and Physiology (Chapter 1)

    • Body Systems: Nervous, Skeletal, Urinary, Lymphatic, Cardiovascular, Reproductive, Muscular, Digestive, Respiratory, Integumentary, Endocrine

    • Systems are studied according to a Hierarchy of Structural Organization; start small and progress to larger

  • Medical Terminology

    • Terminologia Anatomica (developed by the Federative International Committee on Anatomical Terminology) is the authority on medical terminology

    • Prefix = Beginning (Descriptive): location, direction, number, quantity, size, color…

    • Root / Combining Form = Middle (Subject): often body part or system

    • Suffix = Ending (Modifier): disease, condition, procedure, process, specialty…

  • Chapter 1 Anatomical terms

    • § Anatomical position

    • § Body regions

    • § Directional Terminology

    • § Body Planes

    • § Body Cavities

  • Anatomical Position

    • Upright, facing forward (anterior view)

    • Feet together

    • Arms at sides

    • Palms facing forward (supinated)

  • Body Regions (abdominopelvic orientation; quadrants and nine regions)

    • Abdominopelvic quadrants

    • Right Upper Quadrant (RUQ)

    • Right Lower Quadrant (RLQ)

    • Left Upper Quadrant (LUQ)

    • Left Lower Quadrant (LLQ)

    • The four abdominopelvic quadrants are formed by two perpendicular lines that intersect at the navel (umbilicus) – used in clinical discussions

    • Organs shown in diagrams include: Liver, Gallbladder, Large intestine, Small intestine, Appendix, Stomach, Spleen, Urinary bladder

    • Note: The abdominopelvic region map also includes the nine-region description (see below)

    • Abdominopelvic regions (nine regions) [context: $9$ regions]

    • Right hypochondriac, Epigastric, Left hypochondriac

    • Right lumbar, Umbilical, Left lumbar

    • Right inguinal (iliac), Hypogastric, Left inguinal (iliac)

    • Regional anatomical landmarks (from Page 16):

    • Frontal (forehead); Nasal (nose); Ocular / orbital (eye); Otic (ear)

    • Cranial (skull); Cephalic (head); Buccal (cheek); Facial (face)

    • Acromial (shoulder); Cervical (neck); Oral (mouth); Mental (chin)

    • Thoracic (thorax, chest); Dorsal (back); Axillary (armpit); Mammary (breast)

    • Brachial (arm); Antecubital (front of elbow); Antebrachial (forearm); Carpal (wrist); Palmar (palm)

    • Umbilical (navel); Pelvic (pelvis); Lumbar (loin); Abdominal (abdomen); Olecranal (back of elbow)

    • Patellar (kneecap); Crural (leg); Tarsal (ankle); Digits (toes); Hallux (great toe); Pedal (foot)

    • Inguinal (groin); Pubic (pubis); Femoral (thigh); Manual (hand); Gluteal (buttock)

    • Popliteal (back of knee); Sural (calf); Calcaneal (heel of foot); Plantar (sole of foot)

    • Lower limb; Upper limb

    • Anterior view vs. Posterior view (illustrated)

  • Directional Terminology (Chapter 1, Part of Sectional Anatomy)

    • Superior / Inferior

    • Cranial / Caudal

    • Superior = toward the head

    • Inferior = away from the head

    • Example: Nose is superior to mouth; chin is inferior to mouth

    • Anterior / Posterior

    • Ventral / Dorsal

    • Anterior = toward the front of the body; Posterior = toward the back of the body

    • Example: Nose is anterior to ear

    • Medial / Lateral / Intermediate

    • Medial = toward the midline; Lateral = away from the midline; Intermediate = between a more medial and lateral structure

    • Example: Nose is medial to ears

    • Proximal / Distal (Limbs only)

    • Proximal = closer to the point of origin or attachment of a limb to the body trunk; Distal = farther from the point of origin or attachment

    • Example: Shoulder is proximal to elbow; Wrist is distal to elbow

    • Superficial / Deep

    • Superficial = toward or at the body surface; Deep = away from the body surface

    • Example: Muscle is deep to skin; Skin is superficial to liver

  • Directional terms (summary)

    • Directional terms tell us where body parts are located with reference to the body in anatomical position: anterior (ventral), posterior (dorsal), superior, inferior, medial, lateral, proximal, distal, superficial, deep

  • Sectional Anatomy - Body Planes

    • Frontal Plane: Anterior / Posterior (Front / Back)

    • Horizontal / Transverse Plane: Superior / Inferior (Top / Bottom)

    • Sagittal Plane: Left / Right

    • Planes of Section Through an Organ:

    • Longitudinal: cut along the length of an organ

    • Cross / Transverse: cut at right angle to length of the organ

    • Oblique: cut at any angle but a right angle to length is not required

    • Imaging planes (examples from MRI): Transverse / Axial, Frontal / Coronal, Sagittal

  • Body Cavities

    • Ventral Body Cavities: true cavities are closed, fluid-filled, and lined by a double membrane called a serous membrane (serosa)

    • Cavities within cavities (example: Pericardial cavity lies within Thoracic cavity)

  • Serous Membranes

    • Double membranes that line body cavities and organs; allow movement

    • Parietal Serosa lines the cavity (superficial) – Serous fluid lubricates space

    • Visceral Serosa lines the organ (deep) – e.g., Heart: parietal pericardium, visceral pericardium; Lungs: parietal pleura, visceral pleura; Abdomino-pelvic: parietal peritoneum lines abdominal/pelvic walls; visceral peritoneum wraps around organs

  • Dorsal Body Cavity (not a “true” cavity)

    • Cranial cavity – Brain

    • Vertebral cavity – Spinal Cord

    • Contains CSF; tight junctions; creates a high nutrient / low waste environment

  • Types of Imaging (Overview of Tests)

    • X-Ray

    • What it is: quick, painless tests that produce images of internal structures, especially bones

    • What to expect: lie/sit/stand while X-ray machine takes images; you may be asked to move into several positions

    • Duration: $10$-$15$ minutes

    • Imaging method: ionizing radiation

    • Used to diagnose: bone fractures, arthritis, osteoporosis, infections, swallowed items, digestive tract problems, breast cancer

    • CT Scan

    • What it is: series of X-rays to create cross-sections of the inside of the body

    • What to expect: lie on a table that slides into a donut-shaped scanner; X-ray tube rotates around you

    • Duration: $10$-$15$ minutes

    • Imaging method: ionizing radiation

    • Used to diagnose: injuries from trauma, bone fractures, tumors and cancers, vascular disease, heart disease, infections; used to guide biopsies

    • MRI

    • What it is: uses magnetic fields and radio waves to create detailed images of organs and tissues

    • What to expect: lie on a table that slides into a deeper and narrower MRI machine; loud tapping/thumping noises

    • Duration: $45$ minutes to $1$ hour

    • Imaging method: magnetic waves

    • Used to diagnose: aneurysms, multiple sclerosis (MS), stroke, spinal cord disorders, tumors, blood vessel issues; joint or tendon injuries

    • Ultrasound

    • What it is: uses high-frequency sound waves to produce images

    • What to expect: apply gel to skin, press a small probe against it; move to capture images

    • Duration: $30$ minutes to $1$ hour

    • Imaging method: sound waves

    • Used to diagnose: gallbladder disease, breast lumps, genital/prostate issues, joint inflammation, blood flow problems, monitoring pregnancy, guiding biopsies

    • PET Scan

    • What it is: radioactive tracers (radiotracers) and scanning machine to show tissue/organ function

    • What to expect: swallow or have radiotracer injected; enter PET scanner which reads radioactivity from tracer

    • Duration: $1.5$-$2$ hours

    • Imaging method: radiotracers

    • Used to diagnose: cancer, heart disease, coronary artery disease, Alzheimer's disease, seizures, epilepsy, Parkinson's disease

  • Essential Concept #3: Homeostasis - A Dynamic State of Equilibrium

    • Definition: the body’s ability to maintain stable internal conditions in the presence of ever-changing external conditions

    • Failure to maintain homeostasis leads to illness or death

    • Autoregulation (Intrinsic regulation): a process where a cell, tissue, organ, or organ system adjusts in response to environmental change

    • Example: Frank-Starling mechanism of the heart – an increase in myocardial stretch will increase the force/velocity of contraction

    • Extrinsic regulation: regulation from the nervous system or endocrine system

    • Example: Sympathetic nervous system increases heart rate during exercise

  • Homeostatic Control Components (Diagrammatic Description)

    • Input sent via afferent pathway

    • Receptor detects change (imbalance)

    • Control center processes, sends output via efferent pathway

    • Effector executes response

    • Imbalance is corrected; disease results if not corrected

    • Notes: Homeostasis does not keep conditions static; it maintains them within tightly regulated physiological tolerance limits

  • Types of Homeostasis

    • Negative Feedback (Most Common)

    • Provides long-term control; maintains a normal range (not a fixed value)

    • Dynamic and constantly changing; the variable changes in the opposite direction to the initial change

    • Examples: home heating system; blood glucose, body temperature, heart rate, blood pressure, O2/CO2 levels

    • Positive Feedback

    • Causes the variable to change in the same direction as the initial change, accelerating the effect

    • Not common; can lead to self-perpetuating cascades

    • Examples: platelet plug formation; childbirth (Oxytocin response)

  • Quick recap / links

    • Homeostasis concepts and feedback loops are foundational for understanding disease, physiology, and health interventions

    • Review resources referenced in course materials (e.g., SmartArt and external media links)

  • Key formulas / numerical references encountered in this section (for quick reference):

    • Duration examples: 10−15 minutes10-15\text{ minutes} (X-Ray, CT)

    • MRI duration: 45 minutes−1 hour45\text{ minutes} - 1\text{ hour}

    • Ultrasound duration: 30 minutes−1 hour30\text{ minutes} - 1\text{ hour}

    • PET duration: 1.5−2 hours1.5-2\text{ hours}

    • Quadrants: 44 abdominopelvic quadrants

    • Regions: 99 abdominopelvic regions

  • Connections to broader principles

    • The Principle of Complimentary Structure and Function underpins how anatomy supports physiology

    • Hierarchy of Structural Organization connects cells to tissues to organs to organ systems

    • Homeostasis integrates inputs, processing, and outputs to maintain stable internal conditions in a dynamic environment

  • Practical and ethical implications

    • Understanding imaging modalities informs patient safety (e.g., exposure to ionizing radiation, MRI considerations for metal implants)

    • Knowledge of homeostatic mechanisms supports clinical decision-making in disease management (e.g., diabetes management, fever and temperature regulation)

  • Suggested study prompts

    • Explain how structural changes in a heart valve affect blood flow and overall circulation using the principle of complimentary structure and function

    • Identify the four quadrants and nine regions of the abdominopelvic area and name commonly located organs

    • Differentiate between negative and positive feedback with real-life examples

    • Compare and contrast intrinsic (autoregulation) vs extrinsic regulation in physiological processes

    • List the major body cavities and serous membranes and give examples of their parietal and visceral layers

  • End of Chapter 1 notes