A&P1 practical prep

Primary Chest and Abdominal Cavity Organs (Visual ID)

Lungs: Paired thoracic organs cut along a coronal plane. Diaphragm: Thin, skeletal muscle dome sheet dividing the torso cavity. Liver: Massive dark brown organ dominating the upper right side.

Organ Systems of Lungs, Trachea, and Heart

Lungs & Trachea: Respiratory System. Heart: Cardiovascular System.

Organ Systems of Liver, Stomach, Intestines, Spleen, and Thyroid

Liver, Stomach, & Intestines: Digestive System. Spleen: Lymphatic / Immune System. Thyroid Gland: Endocrine System.

Visual Identification of Mitochondrion on Lab Models

Sausage-shaped capsule with double membranes. Inner membrane folds inward to form shelves called cristae. Colored orange/red on lab models.

Precise Function of Mitochondrion

Site of aerobic cellular respiration; primary site of ATP synthesis.

Visual Identification of Golgi Apparatus on Cell Models

A stack of flattened, smoothly curved membranous sacs resembling curved pita bread or pancakes, often surrounded by tiny, spherical budding transport vesicles.

Precise Function of Golgi Apparatus

Modifies, sorts, and packages proteins and lipids received from the endoplasmic reticulum for export.

Visual Identification of Rough Endoplasmic Reticulum

Extensive folded layout of thin membranous sheets branching away from the nucleus, with the surface heavily studded with thousands of tiny dots (ribosomes).

Precise Function of Rough Endoplasmic Reticulum

Synthesizes and modifies proteins destined for cellular membranes, lysosome storage, or outer secretion.

Visual Identification of Smooth Endoplasmic Reticulum

Interconnected meshwork of branching tubules with a completely bare and smooth surface lacking attached ribosomes.

Precise Function of Smooth Endoplasmic Reticulum

Synthesizes lipids (steroids and phospholipids), drives carbohydrate metabolism, and detoxifies toxins/drugs.

Visual ID & Function of Centrosome with Centrioles

Visual ID: Pair of tiny barrel bodies oriented at strict 90-degree right angles showcasing a microtubule triplet pattern. Function: Organizes the microtubule cytoskeleton and forms the mitotic spindle during cell division.

Nucleus vs. Nucleolus (Visual & Functional Differences)

Nucleus: Large spherical structure bounding DNA chromatin; serves as the master cell control center for gene transcription. Nucleolus: Dense, solid internal spherical core nested inside the nucleus; serves as the site of ribosomal RNA (rRNA) synthesis.

Interphase (Visual Markers & Cellular Events)

Visual ID: Nuclear envelope is fully intact; DNA is diffuse threadlike chromatin. Key Event: Cell grows and completely replicates its DNA (S phase).

Prophase (Visual Markers & Cellular Events)

Visual ID: Chromatin condenses into distinct chromosomes; nuclear envelope fragments. Key Event: Mitotic spindle begins structural assembly.

Metaphase (Visual Markers & Cellular Events)

Visual ID: Distinct chromosomes align perfectly single-file down the central midline (metaphase plate). Key Event: Spindle fibers attach securely to the centromere of each chromosome.

Anaphase (Visual Markers & Cellular Events)

Visual ID: Individual sister chromatids separate into V-shaped profiles moving to opposite poles. Key Event: Centromeres cleave apart; spindle microtubules shorten.

Telophase vs. Cytokinesis (Visual Markers & Definitions)

Telophase: Chromosomes unravel back to chromatin; nuclear envelopes re-form (division of nuclear material). Cytokinesis: Membrane pinches inward forming a cleavage furrow (division of physical cytoplasm).

Visual Identification of Simple Squamous Epithelium

A single layer of thin, flattened, scale-like cells with disc-shaped nuclei bulging outward like a fried egg in profile view, featuring a clear apical surface bounding an open lumen or air space.

Simple Squamous Epithelium (Location, Function & System)

Location: Alveoli (air sacs) of lungs. Function: Rapid diffusion and filtration of respiratory gases. System: Respiratory System.

Visual Identification of Simple Cuboidal Epithelium

A single layer of neatly arranged, square/cube-shaped cells with large, perfectly spherical, darkly stained central nuclei; frequently forms circular rings enclosing kidney tubule spaces.

Simple Cuboidal Epithelium (Location, Function & System)

Location: Kidney tubules. Function: Secretion and absorption of bodily fluids. System: Urinary System.

Visual Identification of Simple Columnar Epithelium

A single layer of tall, narrow, rectangular cell columns with oval nuclei neatly aligned in a uniform row near the basal wall, interspersed with pale, mucus-secreting goblet cells.

Simple Columnar Epithelium (Location, Function & System)

Location: Lining of the digestive tract (stomach to rectum). Function: Absorption of nutrients and secretion of lubricating mucus. System: Digestive System.

Visual Identification of Pseudostratified Ciliated Columnar Epithelium

Nuclei rest at varying heights, falsely appearing stratified (though every cell touches the basement membrane); apical surface is heavily adorned with prominent, hair-like cilia.

Pseudostratified Ciliated Columnar Epithelium (Location, Function & System)

Location: Lining of the trachea. Function: Secretion of mucus; ciliary sweeping drives trapped debris away from lungs. System: Respiratory System.

Visual Identification of Non-Keratinized Stratified Squamous Epithelium

Thick, multi-layered membrane structure with cuboidal basal cells and highly flattened apical layers; outermost layers stay alive, retaining visible dark nuclei all the way to the edge.

Non-Keratinized Stratified Squamous Epithelium (Location, Function & System)

Location: Lining of the esophagus and mouth. Function: Protects underlying tissues from intense mechanical abrasion. System: Digestive System.

Transitional Epithelium / Urothelium (Visual ID, Location & Function)

Visual ID: Stratified tissue with rounded, plump dome cells (umbrella cells) when relaxed; flattens out when stretched. Location: Lining of the urinary bladder. Function: Readily stretches to permit distension/expansion.

Skeletal Muscle (Visual ID, Location & Function)

Visual ID: Long, unbranched parallel cylindrical fibers showing distinct alternating light/dark striations; multinucleated with nuclei pushed to the extreme periphery. Location: Attached firmly to bones. Function: Drives voluntary movement and locomotion.

Smooth Muscle (Visual ID, Location & Function)

Visual ID: Spindle-shaped cells with narrow, tapered ends; lacks striations completely; features one centrally located cigar-shaped nucleus. Location: Walls of hollow visceral organs (digestive tract, blood vessels). Function: Propels materials via involuntary contraction.

Cardiac Muscle (Visual ID, Location & Function)

Visual ID: Branched, striated fibers with a single central nucleus; marked by thick dark transverse joint bands called intercalated discs. Location: Found exclusively in the walls of the heart. Function: Involuntary contraction to pump blood into circulation.

Nervous Tissue (Visual ID, Location & Function)

Visual ID: Dominated by large, star-shaped cell bodies (neurons) with radiating branches extending from a central soma, surrounded by a sea of tiny neuroglia nuclei. Location: Brain, spinal cord, and nerves. Function: Neurons propagate rapid electrical impulse signals.

Dense Regular Connective Tissue (Visual ID, Location & Function)

Visual ID: Packed tightly with parallel, wavy bundles of pink collagen fibers; compressed fibroblast nuclei squeezed between rows. Location: Tendons and ligaments. Function: Provides extreme tensile strength to resist pulling along one axis.

Reticular Connective Tissue (Visual ID, Location & Function)

Visual ID: Intricate network of delicate, dark branching reticular fibers resembling a tree limb; spaces are filled with round lymphocytes. Location: Lymph nodes, spleen, and bone marrow. Function: Forms a supportive internal frame skeleton (stroma) for immune cells.

Areolar Connective Tissue (Visual ID, Location & Function)

Visual ID: Highly open, loose layout with thick pink bands (collagen fibers) crossed by thin dark needles (elastic fibers). Location: Widely distributed under epithelia (e.g., lamina propria). Function: Wraps, cushions, and physically protects body organs.

Adipose Connective Tissue (Visual ID, Location & Function)

Visual ID: Resembles open chicken wire or a cluster of bubbles; empty-looking cells (adipocytes) where the lipid mass forces the dark nucleus flush against the wall ("signet ring" appearance). Location: Subcutaneous layer beneath skin, around kidneys. Function: Long-term fat energy storage, heat insulation, and organ protection.

Hyaline Cartilage (Visual ID, Location & Function)

Visual ID: Clean, smooth, glassy pink/blue ground matrix; collagen fibers are sub-microscopic/invisible; chondrocytes dwell inside pockets called lacunae. Location: Covers articular long bone ends, nose, costal cartilages, trachea rings. Function: Resilient shock-absorbing support that lowers joint friction.

Fibrocartilage (Visual ID, Location & Function)

Visual ID: Row arrangements of chondrocytes inside circular lacunae interspersed between thick, visible wavy tracks of heavy blue/pink collagen fibers. Location: Intervertebral discs, pubic symphysis, menisci of knee. Function: Extreme tensile strength to absorb heavy compression.

Elastic Cartilage (Visual ID, Location & Function)

Visual ID: Similar to hyaline but densely crowded with a dark, spider-web-like network of branching elastic fibers. Location: External ear (pinna) and the epiglottis. Function: Provides structural rigidity coupled with snappy flexibility.

Compact Bone (Visual ID, Location & Function)

Visual ID: Resembles a field of cut tree trunks composed of circles called osteons; features a large dark central canal ringed by matrix rings called lamellae. Location: External dense hard shafts of skeletal bones. Function: Rigid weight-bearing support, body protection, and calcium storage.

Spongy Bone (Visual ID, Location & Function)

Visual ID: Honeycomb lattice layout of branching spikes/plates called trabeculae filled with highly vascular red bone marrow. Location: Inner core of flat bones and interior ends of long bones. Function: Resists multi-directional impacts while housing marrow for blood cell production.

Blood Connective Tissue (Visual ID, Location & Function)

Visual ID: Dominated by millions of pink biconcave circular discs lacking nuclei (red blood cells/erythrocytes), interspersed with rare, larger white blood cells/leukocytes with purple nuclei. Location: Contained entirely within the heart and blood vessels. Function: Transports oxygen, carbon dioxide, nutrients, and wastes throughout the body.

Plasma Membrane on Animal Cell Model

Flexible outer boundary of the cell that regulates movement of substances in and out of the cytoplasm.

Cytoplasm on Animal Cell Model

Cellular region between the plasma membrane and nucleus containing cytosol and suspended organelles.

Mitochondria on Animal Cell Model

Orange/red oval organelles with inner membrane folds (cristae), responsible for ATP generation through cellular respiration.

Vacuole on Animal Cell Model

Small, clear spherical sac involved in cellular storage.

Golgi Apparatus on Animal Cell Model

Stack of flattened, curved pink and light-blue membranous sacs that modifies, packages, and sorts proteins.

Centrosome with Centrioles on Animal Cell Model

Black region containing a pair of yellow barrel-like structures at right angles, responsible for organizing microtubules and mitotic spindles.

Smooth Endoplasmic Reticulum on Animal Cell Model

Meshwork of smooth blue branching tubules lacking ribosomes, functioning in lipid synthesis and detoxification.

Rough Endoplasmic Reticulum on Animal Cell Model

Folded blue membranous sheets heavily studded with ribosomes, functioning in protein synthesis and processing.

Ribosome on Animal Cell Model

Tiny white dots located on the rough ER or free in cytoplasm responsible for protein synthesis.

Nucleus on Animal Cell Model

Large central sphere that acts as the control center of the cell and houses genetic material.

Nuclear Envelope with Nuclear Pores on Animal Cell Model

Outer protective double membrane of the nucleus featuring small openings for molecular transport.

Chromosome on Animal Cell Model

Structures of packaged DNA found inside the nucleus that carry hereditary information.

Nucleolus on Animal Cell Model

Dense central core inside the nucleus where ribosomal RNA (rRNA) is synthesized.

Lysosome on Animal Cell Model

Yellow oval-shaped organelle containing hydrolytic enzymes for intracellular digestion.