Final Exam Review Study Guide: Anatomy and Physiology

Comprehensive practice fill-in-the-blank flashcards covering body systems, histology, integumentary, skeletal, muscular, and nervous systems from the Anatomy and Physiology Final Exam Review Study Guide.

Integumentary System

The organ network comprising cutaneous tissue, hair, nails, and exocrine glands that shields deeper tissues against trauma and desiccation, regulates body temperature, synthesizes vitamin D, and detects external stimuli.

Skeletal System

The framework of bones, cartilage, ligaments, and joints that provides structural support, protects vital organs, acts as mechanical levers for locomotion, stores minerals (calcium and phosphate), and produces blood cells via hematopoiesis.

Muscular System

The bodily network of contractile tissues—including skeletal, cardiac, and smooth forms—that facilitates movement, maintains upright posture, circulates internal fluids, and generates heat through cellular metabolism.

Nervous System

The body's primary high-speed regulatory and communication network, composed of the brain, spinal cord, and peripheral nerves, utilizing action potentials and neurotransmitters to integrate sensory input and coordinate motor output.

Endocrine System

The network of ductless glands and hormone-secreting tissues that release chemical messengers directly into circulating blood to control long-term metabolic, growth, developmental, and fluid-balance activities.

Cardiovascular System

The closed circulatory network comprising the heart, blood vessels, and blood that propels oxygen and nutrients to tissues while transporting metabolic wastes and carbon dioxide to excretory organs.

Lymphatic and Immune System

The vascular and cellular network that drains excess interstitial fluid back into venous circulation, absorbs dietary lipids from the gut, and provides defense against pathogens using specialized white blood cells and lymphoid organs.

Respiratory System

The anatomical pathway comprising the nasal passages, pharynx, larynx, trachea, bronchi, and lungs that facilitates gas exchange of oxygen and carbon dioxide between ambient air and circulating blood.

Digestive System

The alimentary canal and accessory organs that mechanically and chemically degrade ingested foodstuffs, absorb water and vital nutrients, and expel undigested solid wastes.

Urinary System

The excretory network consisting of kidneys, ureters, the bladder, and urethra that filters metabolic wastes from blood plasma, maintains electrolyte and fluid balance, and regulates blood pressure and pH.

Male Reproductive System

The biological structures including the testes, epididymides, ductus deferentia, seminal vesicles, and prostate that produce spermatozoa, synthesize testosterone, and transfer gametes.

Female Reproductive System

The biological structures including the ovaries, uterine tubes, uterus, and vagina that generate ova, synthesize estrogen and progesterone, receive sperm, and support gestation and parturition.

Cytology

The microscopic branch of biological anatomy that investigates the morphology, internal organelle structures, physiology, and pathology of individual cells.

Gross Anatomy

The branch of morphology focused on macroscopic organ structures and anatomical features that can be inspected with the unaided eye without microscopic magnification.

Histology

The microscopic study of the architectural structure, organization, and pathology of biological tissues.

Serous Membrane (Serosa)

A double-layered, lubricating sheet composed of simple squamous epithelium resting on loose connective tissue that lines closed internal ventral cavities to prevent frictional wear between organs.

Parietal Layer

The outer portion of a serous membrane that adheres directly to and lines the interior boundaries of a closed ventral body cavity wall.

Visceral Layer

The inner portion of a serous membrane that directly contacts, wraps, and adheres to the external surface of an internal organ.

Four Primary Tissue Classes

The fundamental histological categories that make up the human body: epithelial (covering/lining), connective (support/binding), muscle (contraction/movement), and nervous (communication/control).

Extracellular Matrix (ECM)

The non-cellular material surrounding cells, composed of unstructured ground substance (water, proteoglycans, and glycoproteins) and insoluble protein fibers (collagen, reticular, and elastic fibers).

Epithelial Tissue Classification Criteria

The two primary morphological standards used for identification: the number of cell layers (simple, stratified, or pseudostratified) and the geometric shape of the cells at the apical surface (squamous, cuboidal, or columnar).

Simple Squamous Epithelium

A single layer of flattened, plate-like cells resting on a basal lamina, specialized for rapid passive diffusion and fluid filtration across surfaces like pulmonary alveoli and capillary walls.

Transitional Epithelium (Urothelium)

A specialized stratified tissue whose apical cells alter their shape from rounded domes to flattened scales, allowing distension and recoil in urinary structures like the bladder and ureters.

Endocrine Glands

Ductless glandular structures that synthesize regulatory hormones and secrete them directly into interstitial fluid and capillary beds for systemic distribution.

Exocrine Glands

Glandular structures that release their secretions (such as sweat, mucus, saliva, or digestive enzymes) through epithelial ducts directly onto an apical body surface or into organ lumens.

Hyaline Cartilage

A smooth, glassy supportive tissue with fine type II collagen fibrils that reduces joint friction, provides respiratory support, and constitutes the primary embryonic skeletal model before endochondral ossification.

Elastic Cartilage

A flexible supportive connective tissue enriched with abundant branching elastin fibers within its matrix, maintaining structural shape in the external ear and epiglottis.

Fibrocartilage

A dense, shock-absorbing connective tissue containing thick, parallel bundles of type I collagen fibers, situated in high-compression areas such as intervertebral discs and the pubic symphysis.

Stratum Basale

The deepest single-cell layer of the epidermis resting on the basement membrane, characterized by actively dividing stem cells, tactile cells, and pigment-producing cells.

Stratum Spinosum

The spiny-appearing epidermal layer located directly superior to the germinative layer, composed of keratinocytes linked by desmosomes and interspersed with antigen-presenting dendritic cells.

Stratum Granulosum

The epidermal zone where cells flatten, lose their nuclei, and accumulate dark keratohyalin granules and lipid-releasing lamellar granules to construct the cutaneous water barrier.

Stratum Lucidum

A thin, translucent band of flattened, dead, anucleate keratinocytes containing eleidin, present exclusively in thick skin on the palms and soles.

Stratum Corneum

The outermost epidermal layer consisting of 15 to 30 strata of dead, anucleated, flattened corneocytes packed with keratin and surrounded by extracellular lipids to prevent water loss and physical abrasion.

Melanocytes

Specialized dendritic cells located in the deepest epidermal layer that produce the pigment melanin and transfer it into keratinocytes to protect nuclear DNA from ultraviolet radiation damage.

Osteoblasts

Bone-building cells derived from osteoprogenitor lineages that synthesize and deposit unmineralized organic bone matrix (osteoid) and trigger calcification.

Osteoclasts

Large, multinucleated bone-resorbing cells derived from hematopoietic monocyte lineages that secrete hydrochloric acid and acid hydrolases into a ruffled border to dissolve bone minerals and degrade osteoid.

Osteocytes

Mature bone cells entrapped within mineralized lacunae that project cytoplasmic processes through canaliculi to monitor mechanical strain and coordinate mineral exchange.

Epiphyseal Plate

A disc of hyaline cartilage located at the junction of the diaphysis and epiphysis in growing long bones, where ongoing chondrocyte mitosis drives longitudinal growth.

Synarthrosis

A functional classification for an immovable joint, providing high mechanical strength and protection, as exemplified by cranial sutures and gomphoses.

Amphiarthrosis

A functional classification for a slightly movable joint, balancing stability with limited flexibility, as seen in the pubic symphysis and intervertebral discs.

Diarthrosis

A functional classification for a freely movable joint characterized by a joint capsule, articular cartilage, and a lubricating fluid cavity, such as the shoulder and knee.

Ball-and-Socket Joint

A multiaxial synovial articulation in which a spheroidal head fits into a cup-like depression, allowing motion in three planes (flexion/extension, abduction/adduction, and rotation), as found in the shoulder and hip.

Hinge Joint

A uniaxial synovial articulation where a convex surface fits into a concave notch, restricting movement to a single plane (flexion and extension only), as in the elbow and interphalangeal joints.

Elevation

A joint movement in the frontal or sagittal plane that raises a body part superiorly, such as closing the jaw by lifting the mandible or shrugging the shoulders.

Abduction

A movement that draws an anatomical structure away from the midline of the body in the coronal plane, such as raising an arm laterally.

Extension

A movement in the sagittal plane that increases the angle between articulating bones, typically straightening an extremity or joint from a flexed posture.

Contractility

The physiological capacity of muscle fibers to forcefully shorten and generate pull or mechanical tension when stimulated by an action potential.

Elasticity (Muscle Tissue)

The physical characteristic of muscle fibers and associated connective sheaths to passively recoil and return to their original resting length following elongation.

Myosin

The motor protein that constitutes thick myofilaments, possessing actin-binding heads and ATPase activity that powers cross-bridge cycling during muscle contraction.

Creatine Phosphate

A high-energy molecule held in the sarcoplasm that donates its phosphate group to ADP, rapidly regenerating ATP during the first 10 to 15 seconds of vigorous muscular contraction.

Gap Junctions (Smooth Muscle)

Intercellular channels constructed from connexin proteins that directly couple the sarcoplasm of neighboring myocytes, allowing electrical ions to pass directly and coordinate contraction as a single unit.

Antagonist Muscle

A muscle whose mechanical action opposes that of an agonist (prime mover), providing controlled resistance, deceleration, or stabilization during movement.

Fixator Muscle

A muscle that contracts isometrically to immobilize a bone or the origin of a prime mover, creating a stable platform for movement at distal joints.

Saltatory Conduction

The accelerated transmission of nerve impulses along a myelinated axon, where electrical depolarization leaps from one Node of Ranvier to the next rather than spreading continuously.

Rods

Photoreceptor cells located primarily in the peripheral retina that exhibit high light sensitivity, mediating dim-light and monochromatic night vision without resolving sharp details.

Cones

Photoreceptor cells concentrated in the macula and fovea centralis that function in high-intensity light, providing high visual acuity and trichromatic color vision.

Aqueous Humor

A clear, watery fluid produced by the ciliary body filling the anterior segment of the eye, maintaining intraocular pressure and supplying nutrients to the avascular cornea and lens.

Organ of Corti (Spiral Organ)

The sensory receptor for hearing located along the basilar membrane within the cochlear duct, utilizing hair cells to convert acoustic fluid vibrations into electrical signals.

Optic Disc

The visual blind spot on the posterior fundus where axons of retinal ganglion cells assemble to form the optic nerve and retinal blood vessels penetrate, completely lacking photoreceptive cells.

Ganglion vs. Nucleus

Structural terms for localized aggregates of neuron cell bodies; the former is situated within the peripheral nervous system, whereas the latter resides within the central nervous system.

Nociceptors

Sensory receptors composed of unmyelinated or lightly myelinated free nerve endings that respond to damaging mechanical, thermal, or chemical stimuli and trigger pain perception.

Medulla Oblongata

The caudal-most brainstem division that houses vital autonomic reflex centers responsible for regulating heart rate, vascular tone, respiratory rhythm, vomiting, and swallowing.

Hypothalamus

A diencephalic region located below the thalamus that integrates the autonomic nervous system and endocrine control via the pituitary gland while governing thermoregulation, hunger, thirst, and circadian cycles.

Corpus Callosum

A broad, arching commissural white-matter tract that bridges the medial surfaces of the left and right cerebral hemispheres to allow interhemispheric communication.

Atlas (C1)

The first cervical vertebra, distinguished by the absence of a vertebral body and spinous process, featuring superior articular facets that articulate with the occipital condyles to enable head flexion and extension ('yes' movement).

Axis (C2)

The second cervical vertebra, identified by an upward tooth-like projection called the dens (odontoid process) that serves as a pivot point for rotational head movement ('no' motion).

Cochlea

The snail-shaped, bony labyrinth structure of the inner ear housing fluid-filled scalae and sensory hair cells that transduce sound pressure waves into neural impulses.

Lacrimal Gland

An exocrine gland situated in the superolateral margin of the bony orbit that secretes tear fluid containing lysozyme, mucus, and salts to cleanse, moisten, and lubricate the ocular surface.

Arrector Pili Muscle

A smooth muscle bundle extending from the dermal papillary layer to the connective tissue sheath of a hair follicle; its autonomic contraction pulls the hair upright, generating goosebumps.

Pacinian Corpuscle (Lamellated Corpuscle)

A large, encapsulated sensory receptor located in the reticular dermis and hypodermis, constructed of concentric connective tissue rings around a central axon, specialized for detecting high-frequency vibration and deep pressure.

Meissner's Corpuscle (Tactile Corpuscle)

An encapsulated sensory receptor located within the dermal papillae, specialized for transducing light touch, slow vibrations, and low-frequency tactile sensations.

Sebaceous Gland

A branched holocrine gland typically linked to hair follicles that secretes sebum, an oily lipid substance that waterproofs cutaneous tissue and lubricates hair shafts.

Eccrine Sweat Gland

A coiled tubular merocrine gland found across most of the body that discharges a hypotonic, watery solution onto epidermal surfaces to lower body temperature via evaporative cooling.

Apocrine Sweat Gland

A large coiled tubular gland located primarily in the axillary and anogenital regions that discharges a viscous, lipid- and protein-rich fluid into hair follicles, generating odor upon bacterial decomposition.

Sarcoplasmic Reticulum

The specialized smooth endoplasmic reticulum of muscle fibers that forms mesh-like networks around myofibrils, responsible for sequestering, storing, and releasing calcium ions during excitation-contraction coupling.

Transverse (T) Tubules

Deep, invaginating channels formed by the muscle cell membrane (sarcolemma) that penetrate into the interior of a myocyte, rapidly conducting electrical action potentials directly to terminal cisternae.

Dendrites

Branching cytoplasmic projections extending from a neuron's soma that serve as receptive regions, receiving incoming synaptic input and conducting graded potentials toward the cell body.

Depolarization Phase

The initial upward deflection of an action potential caused by the opening of voltage-gated sodium channels and the resulting rapid influx of sodium ions, shifting the intracellular potential from $-70\,\text{mV}$ toward $+30\,\text{mV}$.

Repolarization Phase

The descending phase of an action potential during which voltage-gated sodium channels close and voltage-gated potassium channels open, allowing potassium ions to flow out of the cell to restore resting negative membrane potential.

Adipose Tissue (Hypodermis)

A specialized loose connective tissue dominated by lipid-storing adipocytes found in the subcutaneous layer, serving as a thermal insulator, shock-absorbing cushion, and major metabolic energy reserve.

Tarsal and Metatarsal Skeleton

The skeletal framework of the human foot consisting of seven proximal tarsal bones (including the calcaneus and talus), five intermediate metatarsals, and fourteen distal phalanges designed to bear weight and propel locomotion.

Anterior Arm Musculature

The flexor muscle compartment of the upper limb—comprising the biceps brachii, brachialis, and coracobrachialis—innervated by the musculocutaneous nerve to flex the elbow and shoulder joints.