Medical Terminology Basics

Word Parts and Their Functions

Medical terms are constructed from distinct word parts, each contributing to the overall meaning. Understanding these components is essential for interpreting and constructing medical vocabulary.

• Prefix: Appears at the beginning of a word and modifies its meaning (e.g., dys- means difficult/abnormal/painful).

• Root / Combining Form: The main part of the word, conveying the core meaning (e.g., gastr/o means stomach).

• Suffix: Appears at the end of a word and often indicates a procedure, condition, or disease (e.g., -itis means inflammation).

Constructed Terms

• Break down terms into their parts and define each component.

• Rebuild the meaning of the whole word by combining the definitions.

• Example: Endocarditis = endo- (inside) + cardi (heart) + -itis (inflammation) = inflammation of the inner lining of the heart.

Common Prefixes

• dys-: difficult, abnormal, or painful

• tachy-: fast

• brady-: slow

• endo-: within

• hyper-: high, excessive

Common Suffixes

• -itis: inflammation

• -tomy: incision or cutting into

• -scopy: visual examination

• -ptysis: spitting or coughing up

• -penia: deficiency or abnormally low number

• -asthenia: weakness

Common Combining Forms

• sphygm/o: pulse

• myel/o: bone marrow (or spinal cord, depending on context)

• gastr/o: stomach

• cephal/o: head

Structural Organization of the Body

Levels of Organization

The human body is organized in a hierarchical structure, from the simplest to the most complex:

• Chemical: Atoms and molecules

• Cellular: Basic unit of life

• Tissue: Groups of similar cells performing a function

• Organ: Structures composed of different tissues

• System: Groups of organs working together

• Organism: The complete living being

Basic Cell Components

• Nucleus: Control center of the cell, contains genetic material

• Mitochondria: Site of energy (ATP) production

• Cytoplasm: Gel-like fluid holding organelles

Directional Terms

• Proximal: Closer to the point of attachment

• Distal: Farther from the point of attachment

• Medial: Toward the midline of the body

• Lateral: Away from the midline

Anatomical Position

• Standard reference: Standing upright, arms at sides, palms facing forward

Body Systems and Organs

Cardiovascular System

The cardiovascular system transports blood, nutrients, and waste products throughout the body. Key terms and concepts include:

• Pericardial membrane: Membrane surrounding the heart within the thoracic cavity

• Atria: Upper chambers of the heart

• Tachycardia: Abnormally fast heart rate

• Dysrhythmia/Arrhythmia: Abnormal heart rhythm

• Myocardial infarction (MI): Heart attack; death of heart muscle tissue due to lack of oxygen

• Endocarditis: Inflammation of the inner lining of the heart or its valves

• Ischemia: Reduced blood flow and oxygen to tissue

• Arteriosclerosis: Hardening of the arteries

• CABG (Coronary Artery Bypass Graft): Surgical procedure to restore blood flow to the heart

Arteries vs. Veins

• Arteries: Thick-walled vessels that carry blood away from the heart

• Veins: Vessels with valves that carry blood back to the heart

Respiratory System

The respiratory system is responsible for gas exchange. Important terms include:

• Lung lobes: Right lung has 3 lobes; left lung has 2 lobes

• COPD: Chronic obstructive pulmonary disease; progressive lung disease

• Pneumonia: Infection/inflammation of the lungs

• Cheyne–Stokes respiration: Cycles of deep and shallow breathing with periods of apnea

• Atelectasis: Collapse of alveoli in the lungs

• Visceral pleura: Inner membrane covering the lungs

• Endotracheal: Located within the trachea

• Hypercapnia: Elevated carbon dioxide (CO2) in the blood

• Oximetry: Measurement of oxygen saturation in the blood

Digestive System

The digestive system processes food for energy and nutrient absorption.

• gastr/o: Stomach (e.g., gastritis = inflammation of the stomach, gastrectomy = surgical removal of the stomach)

Skeletal and Muscular System

This system provides structure, movement, and protection for the body.

• Lower leg bones: Tibia and fibula

• Coccyx: Tailbone

• Herniated disc: Bulging or ruptured spinal disc

• Osteoarthritis: Degenerative joint disease due to wear and tear

• Resuscitate/Resuscitation: To revive from apparent death or unconsciousness

Medical Abbreviations and Acronyms

Abbreviations are commonly used in medical documentation. Recognizing and understanding them is essential.

Diseases and Disorders

Blood and Immune System

• Anemia: Reduced oxygen-carrying capacity of the blood

• Thrombocytopenia: Low platelet count, leading to bleeding or bruising

• Hemolysis: Destruction or rupture of red blood cells (RBCs)

• Hemoglobin: Oxygen-carrying protein in RBCs

• Leukocytes: White blood cells, key to immune defense

• Non-Hodgkin lymphoma: Cancer of the lymphatic system

Cardiovascular System

• MI, endocarditis, ischemia, arteriosclerosis, dysrhythmia

Respiratory System

• COPD, pneumonia, atelectasis, hypercapnia

Musculoskeletal System

• Osteoarthritis, herniated disc, quadriplegia (paralysis of all four limbs)

Allergy

• Anaphylaxis: Severe, life-threatening allergic reaction

Common Signs and Symptoms

• Epistaxis: Nosebleed

• Jaundice: Yellowing of skin and eyes, often due to liver dysfunction

• Diaphoresis: Excessive sweating

• Hematoma: Collection of blood under the skin or tissue (bruise or lump)

• Quadriplegia: Paralysis of all four limbs

• -asthenia: Suffix meaning weakness

Diagnostic Tools and Procedures

• Auscultation: Listening to internal body sounds, typically with a stethoscope

• MRI: Imaging technique using magnets, excellent for soft tissue visualization

• -scopy procedures: Visual examination using a scope (e.g., endoscopy, bronchoscopy)

• -tomy: Suffix indicating incision into an organ or tissue

• Oximetry: Measurement of oxygen saturation in the blood

Term Construction Examples

• Tachycardia: tachy- (fast) + cardi (heart) + -ia (condition) = fast heart rate

• Bradypnea: brady- (slow) + -pnea (breathing) = slow breathing

• Thrombocytopenia: thrombocyte (platelet) + -penia (deficiency) = low platelet count

• Endocarditis: endo- (inside) + cardi (heart) + -itis (inflammation) = inflammation of the inner lining of the heart

Additional info: Where context was missing, standard definitions and explanations were provided to ensure completeness and clarity for exam preparation.