Introduction to Anatomy & Physiology

Overview

Anatomy and Physiology are foundational sciences for health professions, providing essential knowledge about the structure and function of the human body. This chapter introduces the language, concepts, and systems used in these disciplines.

• Anatomy: The study of the internal and external structures of the human body.

• Physiology: The study of the function and vital processes of body structures.

• Medical Terminology: Specialized language used by health professionals, primarily derived from Greek and Latin.

Medical Terminology

Word Roots, Prefixes, and Suffixes

Medical terms are constructed from word roots, prefixes, and suffixes, allowing precise communication about body structures, functions, and diseases.

• Word Root: The basic part of a term that provides its core meaning.

• Prefix: Added to the beginning of a word root to modify its meaning.

• Suffix: Added to the end of a word root to alter its meaning.

• Combining Form: A word root with a connecting vowel (usually 'o').

Example: Gastritis (inflammation of the stomach) is formed from "gastr-" (stomach) and "-itis" (inflammation).

Pronunciation Guide: Key terms are pronounced as follows:

• Metabolism (meh TAB oh lizm)

• Anatomy (ah NA tom ee)

• Diagnosis (dye ag NOH sis)

• Etiology (EE tee ALL oh jee)

• Homeostasis (HOH mee oh STAY sis)

• Macroscopic anatomy (MAK roh SCOP ic)

• Microscopic anatomy (MY kroh SCOP ic)

• Pathology (path ALL oh jee)

• Physiology (fiz ee ALL oh jee)

• Prognosis (prog NOH sis)

• Rhinoplasty (RYE noh PLASS tee)

• Syndrome (SIN drohm)

Anatomy

Definition and Specialties

Anatomy is the study of the structure of the human body, both internal and external. The term originates from the Greek meaning "to cut apart." There are two main specialties:

• Microscopic Anatomy: Study of structures only visible with magnification aids (e.g., microscope).

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

Microscopic Anatomy

• Cytology: Study of cellular structures.

• Histology: Study of tissue samples.

Macroscopic (Gross) Anatomy

• Study of the skeletal system.

• Radiology (e.g., looking at an x-ray).

• Examination of the body in autopsy.

Physiology

Definition and Subspecialties

Physiology focuses on the function and vital processes of anatomical structures. It is closely related to anatomy, as it explains how structures work together to maintain life.

• Human Physiology: Study of human body functions.

• Animal Physiology: Study of animal body functions.

• Cellular Physiology: Study of cell functions.

• Neurophysiology: Study of nervous system functions.

Relationship Between Anatomy and Physiology

Integration of Structure and Function

Anatomy focuses on how the body is put together, while physiology studies how these structures work together to maintain life. The design of a structure is often related to its function.

• Disruption of normal structure or function can lead to disease.

• Pathophysiology: Study of disease processes.

Metric and English Systems of Measurement

Measurement in Health Professions

Accurate measurement is essential in anatomy and physiology. Two major systems are used:

• United States Customary System (USCS): Also called the English system.

• Système International (SI): Also called the Metric system; based on powers of 10.

Language of Disease

Key Terms and Concepts

Disease is a condition in which the body fails to function normally, often due to disruption of homeostasis. Understanding the language of disease is essential for diagnosis and treatment.

• Signs: Objective, measurable indicators (e.g., fever, blood pressure).

• Symptoms: Subjective experiences reported by the patient (e.g., pain, nausea).

• Syndrome: A set of signs and symptoms that commonly occur together.

• Diagnosis: Identification of a disease based on signs, symptoms, history, and tests.

• Prognosis: Prediction of the outcome of a disease.

• Etiology: The cause of a disease.

• Pathology: Study of disease.

• Remission: Signs and symptoms disappear.

• Relapse: Signs and symptoms reoccur.

• Exacerbate: Signs and symptoms worsen.

• Terminal: Prognosis is death.

• Morbidity: Measure of disabilities and problems caused by illness.

• Mortality: Measure of deaths attributed to a disease.

Types of Disease Occurrence

• Endemic: Disease continually present in a population or region.

• Epidemic: Disease occurs suddenly in large numbers in a region.

• Pandemic: Disease spreads country or worldwide.

Metabolic Syndrome (Syndrome X)

Definition and Clinical Application

Metabolic Syndrome is a cluster of conditions that increase the risk of diabetes, heart attack, and stroke. It is often the result of poor diet and lack of exercise.

• High blood sugar levels (hyperglycemia)

• High blood pressure (hypertension)

• Abdominal obesity

• High triglycerides

• Low HDL (good cholesterol)

Homeostasis

Concept and Importance

Homeostasis is the physiological process that maintains a stable internal environment. Survival depends on the body's ability to regulate variables such as heart rate and blood pressure within set points.

• Homeostatic Regulation: Adjustments made to maintain stability.

• Example: A thermostat regulates temperature in a home, similar to how the body regulates internal conditions.

Feedback Loops

• Negative Feedback Loop: Opposes the stimulus to maintain homeostasis. Example: As blood sugar increases, insulin is released to lower it.

• Positive Feedback Loop: Increases the magnitude of change, moving away from a set point. Examples: Uterine contractions during labor, immune response, coagulation system.

Metabolism

Definition and Processes

Metabolism refers to all energy and material transformations within living cells. It is divided into two opposite processes:

• Anabolism: Building up simpler compounds to manufacture materials for growth, repair, and reproduction.

• Catabolism: Breaking down complex substances into simpler ones.

Metabolic Equation:

Vital Signs and Disease Indicators

Objective and Subjective Measures

• Vital Signs: Pulse, respirations, temperature, and blood pressure.

• Signs: Objective, measurable values.

• Symptoms: Subjective patient perceptions.

Case Study Example

Application of Terminology and Concepts

A 45-year-old male involved in a vehicular accident presents with shortness of breath (SOB), abdominal pain, acrocyanosis, tachycardia, and a history of coronary artery disease (CAD). He weighs 150 pounds and is 5 feet 6 inches tall. Chest x-ray shows cardiomegaly, and blood pressure is 155/95 mmHg. Facial injuries require future rhinoplasty surgery. An ECG and lower series are ordered.

• Chief Complaint (CC): SOB and abdominal pain.

• Etiology: Vehicular accident and underlying CAD.

• Medical Terms: Acrocyanosis (bluish discoloration of extremities), tachycardia (rapid heart rate), cardiomegaly (enlarged heart), rhinoplasty (nasal surgery).

Summary Table: Key Terms and Definitions

Additional info:

• Some content was inferred and expanded for clarity and completeness, such as the summary tables and the metabolic equation.

• Examples and applications were added to illustrate key concepts.