Introduction

This study guide covers foundational topics in Anatomy & Physiology, including definitions, organ systems, cellular processes, and physiological mechanisms. Each section provides clear explanations, definitions, and examples to support exam preparation.

General Terminology and Concepts

Definitions and Distinctions

• Endemic vs. Epidemic: Endemic refers to a disease regularly found among particular people or in a certain area. Epidemic is a sudden increase in the number of cases of a disease above what is normally expected.

• Hepatitis: Inflammation of the liver, often caused by viral infection, toxins, or autoimmune processes.

• Standard Precautions: Infection control practices used to prevent transmission of diseases (e.g., hand hygiene, use of gloves).

• Cranial: Refers to the head or skull region.

Anatomical Orientation and Body Organization

Body Planes and Positions

• Prone Position: Lying face down.

• Supine Position: Lying face up.

• Body Planes: Imaginary lines dividing the body:

  • Sagittal Plane: Divides body into left and right.

  • Frontal (Coronal) Plane: Divides body into anterior and posterior.

  • Transverse Plane: Divides body into superior and inferior.

• Abdominal Quadrants: Four regions used to localize organs: right upper, left upper, right lower, left lower.

Organ and System Identification

• Organs in Abdominal Quadrants: For example, the liver is primarily in the right upper quadrant, while the spleen is in the left upper quadrant.

• pH Scale: Measures acidity/alkalinity; 7 is neutral, below 7 is acidic, above 7 is basic.

Cellular Structure and Function

Cellular Components

• Glucose: A simple sugar (C6H12O6) used as a primary energy source by cells.

• Mitochondria: Organelles that produce ATP via cellular respiration.

• Osmotic Fluids: Isotonic (equal solute), Hypertonic (higher solute outside), Hypotonic (lower solute outside).

• Facilitated Diffusion: Passive transport of substances across membranes via protein channels.

Cellular Transport and Communication

• Diffusion: Movement of molecules from high to low concentration.

• Transitional Epithelium: Specialized tissue that stretches, found in the urinary bladder.

Tissues and Organs

Types and Functions

• Muscle Tissue: Types include skeletal, cardiac, and smooth; classified by shape and arrangement.

• Largest Organ: The skin (integumentary system).

• Appendicular Skeleton: Bones of the limbs and girdles.

• Osteoblasts, Osteoclasts, Osteocytes: Cells involved in bone formation, resorption, and maintenance.

Vascular and Connective Tissue

• Vasoconstriction: Narrowing of blood vessels, increases blood pressure.

• Vasodilation: Widening of blood vessels, decreases blood pressure.

• Ligament vs. Tendon: Ligaments connect bone to bone; tendons connect muscle to bone.

Muscular System

Muscle Types and Functions

• Striated Muscle: Skeletal and cardiac muscle, characterized by striped appearance.

• Smooth Muscle: Found in walls of hollow organs; involuntary control.

• Muscle Contraction: Involves actin and myosin filaments sliding past each other.

Blood and Circulatory System

Blood Components and Functions

• Bilirubin: Pigment formed from breakdown of hemoglobin; excess causes jaundice.

• Vessels: Arteries, veins, and capillaries transport blood throughout the body.

Nervous System

Structure and Function

• Meninges: Protective membranes covering the brain and spinal cord.

• Meningitis: Inflammation of the meninges, often due to infection.

• Corpus Callosum: Large band of nerve fibers connecting the two cerebral hemispheres.

• Somatic Sensory Cortex: Region of the brain that processes sensory input from the body.

• Medulla Oblongata: Controls vital functions such as breathing and heart rate.

• Neurotransmitters: Chemical messengers (e.g., norepinephrine, epinephrine) released at synapses.

Endocrine and Reproductive Systems

Hormones and Glands

• FSH (Follicle Stimulating Hormone): Released by the anterior pituitary; stimulates gamete production.

• Phases of Menstrual Cycle: Follicular, ovulation, luteal, and menstruation.

• Gametes: Sperm (male) and ova (female); produced by gametogenesis.

Digestive System

Organs and Processes

• Stomach: Organ involved in mechanical and chemical digestion.

• Large vs. Small Intestine: Small intestine absorbs nutrients; large intestine absorbs water and forms feces.

• Phases of Digestion: Ingestion, propulsion, mechanical digestion, chemical digestion, absorption, defecation.

Respiratory System

Structure and Function

• Upper vs. Lower Respiratory Tract: Upper includes nose, pharynx, larynx; lower includes trachea, bronchi, lungs.

• Ventilation vs. Respiration: Ventilation is air movement; respiration is gas exchange.

• Surfactant: Substance that reduces surface tension in alveoli, preventing collapse.

Immune System

Cells and Functions

• Macrophages: Phagocytic cells that engulf pathogens.

• T Cells and B Cells: Lymphocytes involved in adaptive immunity; T cells mediate cellular immunity, B cells produce antibodies.

Feedback Mechanisms

Homeostasis

• Negative Feedback: Mechanism that reverses a change to maintain homeostasis (e.g., body temperature regulation).

• Positive Feedback: Mechanism that amplifies a change (e.g., blood clotting).

Medical Terminology

Signs vs. Symptoms

• Signs: Objective evidence of disease (e.g., rash, fever).

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

Medical Chart Components

• Three Parts: History, examination, and diagnosis/treatment plan.

Tables

Comparison of Muscle Types

Phases of Mitosis

Key Equations and Formulas

• Osmosis: $J = -P (C_2 - C_1)$, where J is the flux, P is permeability, and C is concentration.

• pH Calculation: $pH = -\log_{10}[H^+]$

• Body Mass Index (BMI): $BMI = \frac{weight\ (kg)}{height^2\ (m^2)}$

Additional info: Some content was inferred and expanded for academic completeness and clarity.