Comprehensive Study Guide: Anatomy & Physiology Exam Review

Introduction to Anatomy & Physiology

Characteristics of Life

• Organization: Living things exhibit a complex but ordered organization.

• Metabolism: All chemical reactions occurring in the body, including catabolism and anabolism.

• Responsiveness: Ability to sense and respond to stimuli.

• Growth and Development: Increase in size and functional abilities.

• Reproduction: Production of new cells or organisms.

• Homeostasis: Maintenance of a stable internal environment.

Structural Organization of the Human Body

• Chemical Level: Atoms and molecules.

• Cellular Level: Cells and their organelles.

• Tissue Level: Groups of similar cells.

• Organ Level: Contains two or more types of tissues.

• Organ System Level: Organs that work closely together.

• Organismal Level: All organ systems combined to make the whole organism.

Planes of Section

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

• Sagittal Plane: Divides the body into right and left parts (midsagittal is equal halves).

• Transverse (Horizontal) Plane: Divides the body into superior and inferior parts.

Homeostasis and Feedback Systems

• Homeostasis: The body's ability to maintain stable internal conditions.

• Feedback Systems: Mechanisms that regulate homeostasis.

• Negative Feedback: Reduces the effect of the stimulus (e.g., body temperature regulation).

• Positive Feedback: Enhances the effect of the stimulus (e.g., blood clotting).

Cell Chemistry & Cell Components

Principle of Complementarity of Structure and Function

• Structure determines function; function reflects structure.

Major Elements and Chemical Bonds

• Major Elements: Oxygen, carbon, hydrogen, nitrogen.

• Chemical Bonds: Ionic, covalent, and hydrogen bonds.

• Example: Water molecules are held together by polar covalent bonds; hydrogen bonds form between water molecules.

Types of Chemical Reactions

• Synthesis (Anabolic): $A + B \rightarrow AB$

• Decomposition (Catabolic): $AB \rightarrow A + B$

• Exchange: $AB + CD \rightarrow AD + CB$

pH and Buffers

• pH: Measure of hydrogen ion concentration; scale from 0 (acidic) to 14 (basic).

• Buffers: Substances that minimize changes in pH.

Energy & Cell Processes

ATP and Cellular Respiration

• ATP (Adenosine Triphosphate): Main energy currency of the cell.

• Cellular Respiration: Process of converting glucose and oxygen into ATP, water, and carbon dioxide.

• Equation:

$C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O + ATP$

• Enzymes: Biological catalysts that speed up chemical reactions.

Tissues & Histology

Four Basic Tissue Types

• Epithelial Tissue: Covers surfaces, lines cavities, forms glands.

• Connective Tissue: Supports, protects, binds other tissues (e.g., bone, blood, adipose).

• Muscle Tissue: Contracts to produce movement (skeletal, cardiac, smooth).

• Nervous Tissue: Initiates and transmits electrical impulses.

Classification of Epithelia

• By Layers: Simple (one layer), stratified (multiple layers).

• By Shape: Squamous (flat), cuboidal (cube-shaped), columnar (tall).

Connective Tissue Types

• Loose Connective Tissue: Areolar, adipose, reticular.

• Dense Connective Tissue: Dense regular, dense irregular, elastic.

• Specialized: Cartilage, bone, blood.

Integumentary System

Skin Structure and Function

• Epidermis: Stratified squamous epithelium; avascular.

• Dermis: Dense irregular connective tissue; contains blood vessels, nerves, glands.

• Hypodermis: Subcutaneous layer; mostly adipose tissue.

Functions of the Skin

• Protection, temperature regulation, sensation, vitamin D synthesis, excretion.

Skin Layers

• Stratum Basale (deepest), Stratum Spinosum, Stratum Granulosum, Stratum Lucidum (only in thick skin), Stratum Corneum (outermost).

Skin Cancers

• Basal Cell Carcinoma (most common), Squamous Cell Carcinoma, Melanoma (most dangerous).

Bones & Skeletal Tissue

Bone Classification

• Long Bones: Longer than wide (e.g., femur).

• Short Bones: Cube-shaped (e.g., carpals).

• Flat Bones: Thin, flat (e.g., sternum).

• Irregular Bones: Complex shapes (e.g., vertebrae).

Bone Cells

• Osteoblasts: Bone-forming cells.

• Osteocytes: Mature bone cells.

• Osteoclasts: Bone-resorbing cells.

Bone Growth and Remodeling

• Ossification: Process of bone formation.

• Remodeling: Continuous replacement of old bone tissue by new bone tissue.

• Hormonal Regulation: Parathyroid hormone (PTH) increases blood calcium; calcitonin decreases it.

The Skeletal System

Axial and Appendicular Skeleton

• Axial Skeleton: Skull, vertebral column, rib cage.

• Appendicular Skeleton: Limbs and girdles.

Major Bones and Landmarks

• Know the names and locations of major bones (e.g., femur, humerus, scapula, pelvis).

Joints

Classification of Joints

• Structural: Fibrous, cartilaginous, synovial.

• Functional: Synarthroses (immovable), amphiarthroses (slightly movable), diarthroses (freely movable).

Synovial Joints

• Features: Joint cavity, articular cartilage, synovial fluid, ligaments.

• Types: Plane, hinge, pivot, condyloid, saddle, ball-and-socket.

• Movements: Flexion, extension, abduction, adduction, rotation, circumduction.

Muscle Tissue & Muscles

Types of Muscle Tissue

• Skeletal Muscle: Voluntary, striated, multinucleated.

• Cardiac Muscle: Involuntary, striated, intercalated discs.

• Smooth Muscle: Involuntary, non-striated, spindle-shaped cells.

Muscle Contraction

• Sliding Filament Mechanism: Actin and myosin filaments slide past each other to shorten the muscle.

• Neuromuscular Junction: Site where motor neuron stimulates muscle fiber.

• Action Potential: Electrical signal that triggers muscle contraction.

• Calcium Ions: Essential for contraction; bind to troponin, moving tropomyosin and exposing binding sites on actin.

Muscle Metabolism

• ATP is generated by creatine phosphate, anaerobic glycolysis, and aerobic respiration.

Nervous Tissue and Nervous System

Neurons and Neuroglia

• Neurons: Excitable cells that transmit electrical signals.

• Neuroglia: Support, protect, and insulate neurons.

Central and Peripheral Nervous Systems

• CNS: Brain and spinal cord.

• PNS: Cranial and spinal nerves.

Action Potential

• Rapid change in membrane potential that propagates along the axon.

• Resting Membrane Potential: Typically -70 mV; maintained by sodium-potassium pump.

• Depolarization: Influx of Na+ ions.

• Repolarization: Efflux of K+ ions.

Neurotransmitters

• Chemical messengers (e.g., acetylcholine, dopamine, serotonin, GABA).

• Bind to receptors on postsynaptic membrane to propagate or inhibit signals.

The Central Nervous System

Major Brain Regions

• Cerebrum: Higher brain functions; divided into lobes (frontal, parietal, temporal, occipital).

• Cerebellum: Coordination of movement and balance.

• Brainstem: Midbrain, pons, medulla oblongata; controls vital functions.

Spinal Cord

• Conducts impulses to and from the brain; center for reflexes.

The Peripheral Nervous System

Cranial and Spinal Nerves

• 12 pairs of cranial nerves; 31 pairs of spinal nerves.

• Transmit sensory and motor information between CNS and body.

The Autonomic Nervous System

Divisions

• Sympathetic: "Fight or flight" responses.

• Parasympathetic: "Rest and digest" responses.

The Special Senses

Major Senses

• Vision, hearing, taste, smell, equilibrium.

The Endocrine System

Hormones and Glands

• Hormones are chemical messengers secreted by endocrine glands (e.g., pituitary, thyroid, adrenal).

• Regulate growth, metabolism, reproduction, and homeostasis.

The Blood

Components of Blood

• Plasma: Liquid matrix; contains water, proteins, nutrients, hormones.

• Formed Elements: Erythrocytes (RBCs), leukocytes (WBCs), platelets.

The Heart and Blood Vessels

Heart Structure and Function

• Four chambers: right/left atria, right/left ventricles.

• Valves prevent backflow of blood.

• Blood flow: body → right atrium → right ventricle → lungs → left atrium → left ventricle → body.

Blood Vessels

• Arteries: Carry blood away from the heart.

• Veins: Carry blood toward the heart.

• Capillaries: Exchange of gases, nutrients, and wastes.

The Lymphatic and Immune Systems

Lymphatic System

• Returns interstitial fluid to the bloodstream; involved in immune responses.

Immune System

• Defends against pathogens; includes innate and adaptive immunity.

The Respiratory System

Major Structures and Functions

• Nasal cavity, pharynx, larynx, trachea, bronchi, lungs.

• Gas exchange occurs in alveoli.

• Oxygen is transported by hemoglobin in red blood cells.

The Digestive System

Major Organs and Functions

• Mouth, pharynx, esophagus, stomach, small intestine, large intestine, liver, pancreas, gallbladder.

• Digestion, absorption, and elimination of food.

Metabolism and Nutrition

Metabolism

• Sum of all chemical reactions in the body.

• Anabolism: Building up molecules.

• Catabolism: Breaking down molecules.

The Urinary System

Major Structures and Functions

• Kidneys, ureters, bladder, urethra.

• Removes waste, regulates fluid and electrolyte balance.

The Reproductive System

Male and Female Reproductive Systems

• Know the structures and functions of testes, ovaries, uterus, etc.

Human Development and Heredity

Development

• Fertilization, embryonic and fetal development, birth.

Heredity

• Transmission of genetic traits from parents to offspring.

Sample Table: Types of Muscle Tissue

Type	Location	Control	Striations
Skeletal	Attached to bones	Voluntary	Yes
Cardiac	Heart	Involuntary	Yes
Smooth	Walls of hollow organs	Involuntary	No

Additional info: Some explanations and examples were expanded for clarity and completeness based on standard Anatomy & Physiology curricula.