Course Overview and Success Strategies

Course Structure and Grading

This course introduces the fundamental principles of anatomy and physiology, focusing on the structure and function of the human body. The grading system is designed to assess attendance, homework assignments, and unit exams.

• Attendance: 70 points (7 pts/day; 50% deduction for tardiness)

• Homework Assignments: 330 points (Online, via Blackboard; 10% late penalty per week)

• Unit Exams: 300 points (100 pts/exam; in-person)

• Total: 700 points

Refer to the course's grading scale for letter grade conversion.

Keys for Success

• Attend lectures regularly

• Make and use flashcards

• Form study groups for collaborative learning

• Evaluate your understanding constantly

• Ask for help when needed

• Check Blackboard for updates and assignments

• Consider handwriting your notes for better retention

Additional info: Research suggests that handwritten notes may improve memory and understanding compared to typed notes.

Introduction to Anatomy and Physiology

Purpose of the Chapter

This chapter provides an overview of the disciplines of anatomy and physiology, the organization of the human body, the properties of living things, the concept of homeostasis, anatomical terminology, and medical imaging techniques.

• Introduce anatomy and physiology

• Discuss human body organization

• Describe properties of living things

• Explain homeostasis

• Use anatomical terminology

• Discuss medical imaging in medicine

Anatomy vs. Physiology

Definitions and Distinctions

Anatomy and physiology are closely related fields that together explain the structure and function of the human body.

• Anatomy: The study of the structure of body parts (e.g., organs, tissues, cells).

• Physiology: The study of the function of body parts and how they work together to sustain life.

Example: The anatomy of the heart includes its chambers and valves; physiology explains how the heart pumps blood.

Branches of Anatomy

• Embryology: Study of development during the first eight weeks after fertilization.

• Developmental Biology: Study of the complete development of an individual from fertilization to death.

• Cell Biology: Study of cellular structure and functions.

• Histology: Study of microscopic structure of tissues.

• Gross Anatomy: Study of structures visible to the naked eye.

• Systemic Anatomy: Study of specific systems (e.g., respiratory, digestive).

• Regional Anatomy: Study of specific regions (e.g., head, chest).

• Surface Anatomy: Study of surface markings for visualization and palpation.

• Imaging Anatomy: Study of internal structures using imaging techniques (e.g., MRI, CT).

• Pathological Anatomy: Study of structural changes associated with disease.

Branches of Physiology

• Neurophysiology: Study of functional properties of nerve cells.

• Endocrinology: Study of hormones and their control of body functions.

• Immunology: Study of the body's defenses against disease-causing agents.

• Respiratory Physiology: Study of functions of the air passageways and lungs.

• Renal Physiology: Study of kidney functions.

• Pathophysiology: Study of functional changes associated with disease and aging.

Levels of Structural Organization and Body Systems

Levels of Organization

The human body is organized into several hierarchical levels:

• Chemical level: Atoms and molecules

• Cellular level: Cells and their organelles

• Tissue level: Groups of similar cells

• Organ level: Structures composed of two or more tissue types

• System level: Related organs with a common function

• Organismal level: The living individual

Body Systems

There are eleven major systems in the human body:

• Integumentary

• Skeletal

• Muscular

• Nervous

• Endocrine

• Cardiovascular

• Lymphatic/Immune

• Respiratory

• Digestive

• Urinary

• Reproductive

Additional info: Each system has specific organs and functions but works interdependently with other systems.

Characteristics of the Living Human Organism

Basic Life Processes

Living things share several key characteristics that distinguish them from nonliving matter:

• Metabolism: Sum of all chemical processes in the body, including:

  • Catabolism: Breakdown of complex molecules (e.g., digestion)

  • Anabolism: Synthesis of complex molecules (e.g., growth)

• Responsiveness: Ability to detect and respond to changes (e.g., shivering when cold)

• Movement: Motion of the body, organs, cells, or structures within cells

• Growth: Increase in body size due to cell size or number

• Differentiation: Development of a cell from an unspecialized to a specialized state

• Reproduction: Formation of new cells for growth, repair, or production of a new organism

Homeostasis

Definition and Importance

Homeostasis is the maintenance of a stable internal environment within physiological limits. It is essential for normal body function and survival.

• Maintains variables such as pH, temperature, and electrolyte balance within narrow ranges.

• Disruption of homeostasis can lead to disease or death.

Normal Ranges for Key Variables

Body Fluids and Homeostasis

• Intracellular fluid (ICF): Fluid within cells

• Extracellular fluid (ECF): Fluid outside cells, including:

  • Interstitial fluid: Fluid between cells

  • Blood plasma: Liquid component of blood

Control of Homeostasis: Feedback Systems

Homeostasis is maintained by feedback systems that monitor and adjust physiological variables.

• Receptor: Monitors changes and sends input to the control center

• Control Center: Sets the range of values and sends output to effectors

• Effector: Produces a response to restore homeostasis

Negative Feedback

In negative feedback, the response reverses the original stimulus, maintaining homeostasis. Most feedback systems in the body are negative.

Example: Regulation of body temperature, blood glucose levels.

Positive Feedback

In positive feedback, the response enhances or amplifies the original stimulus. These are less common and usually occur during specific events.

• Examples: Childbirth (oxytocin release), blood clotting

Homeostatic Imbalances

• Disorder: General term for any abnormality of function (e.g., arrhythmia)

• Disease: Specific illness with recognizable signs and symptoms

• Local disease: Affects one part or region (e.g., ear infection)

• Systemic disease: Affects multiple parts or the whole body (e.g., diabetes)

• Symptoms: Subjective changes (e.g., headache, nausea)

• Signs: Objective, measurable changes (e.g., fever, rash)

Basic Anatomical Terminology

Body Positions

The anatomical position is a standardized method of observing the body:

• Standing erect, facing forward

• Arms at sides, palms facing forward

• Feet flat on the floor

Regional Names

Specific regions of the body are given names for reference (e.g., cephalic for head, thoracic for chest).

Directional Terms

Directional terms are used to precisely locate one part of the body relative to another.

Planes and Sections

Imaginary flat surfaces called planes are used to divide the body for study:

• Sagittal plane: Divides body into right and left parts

• Frontal (coronal) plane: Divides body into anterior and posterior parts

• Transverse (horizontal) plane: Divides body into superior and inferior parts

• Oblique plane: Passes through the body at an angle

Body Cavities

Body cavities are spaces within the body that protect, separate, and support internal organs.

• Cranial cavity: Contains the brain

• Vertebral canal: Contains the spinal cord

• Thoracic cavity: Contains heart and lungs

• Abdominopelvic cavity: Contains digestive, urinary, and reproductive organs

Serous Membranes

Serous membranes are thin, double-layered membranes that cover organs (viscera) and line body cavities.

• Visceral layer: Covers the organ

• Parietal layer: Lines the cavity wall

• Serous fluid: Reduces friction between layers

Examples: Pericardium (heart), pleura (lungs), peritoneum (abdominal organs)

Abdominopelvic Regions and Quadrants

The abdominopelvic cavity can be divided into regions or quadrants to describe organ locations more precisely.

• Regions: Nine regions (e.g., epigastric, umbilical, hypogastric)

• Quadrants: Four quadrants (right upper, left upper, right lower, left lower)

Medical Imaging

Overview

Medical imaging techniques allow physicians to visualize internal structures for diagnosis and treatment.

Major Imaging Techniques

• Radiography (X-rays): Uses X-rays to produce images of internal structures; useful for bones and some soft tissues.

• Magnetic Resonance Imaging (MRI): Uses strong magnetic fields and radio waves to produce detailed images of soft tissues; cannot be used with metal implants.

• Computed Tomography (CT): Uses X-rays and computer processing to create cross-sectional images; useful for detecting tumors and internal injuries.

• Ultrasound (Sonography): Uses high-frequency sound waves to produce images; safe and commonly used in pregnancy.

• Coronary Computed Tomography Angiography (CCTA): Specialized CT scan for visualizing coronary blood vessels.

• Positron Emission Tomography (PET): Uses radioactive substances to visualize metabolic activity; useful for studying physiology of organs.

• Endoscopy: Visual examination of internal organs using a flexible tube with a camera; examples include colonoscopy and laparoscopy.

Additional info: Each imaging technique has specific indications, advantages, and limitations depending on the clinical scenario.