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ANATOMY AND PHYSIOLOGY FINAL EXAM 2026 COMPLETE
ACCURATE TEST ACTUAL QUESTIONS AND COERRECT
DETAILED ANSWERS WITH RATIONALES (100% CORRECT
VERIFIED SOLUTIONS) LATEST UPDATED VERSION 2026
EDITION |ALREADY GRADED A+ (BRAND NEW!) FULL
REVISED |APPROVED EXAM
Which of the following describes the anatomical position? A) Body standing erect, face forward, arms at sides, palms facing backward B) Body lying down, face up, arms crossed, palms facing thighs C) Body standing erect, face forward, arms at sides, palms facing forward CORRECT ANSWER D) Body seated, face forward, arms raised, palms facing down Rationale: The anatomical position is a standardized reference posture: upright, facing forward, arms at sides with palms supinated (forward). This ensures consistent directional terminology. Option C correctly describes this; A has palms backward (pronated), B is supine but not standing, D is seated. Which plane divides the body into equal left and right halves? A) Frontal plane B) Transverse plane C) Midsagittal plane CORRECT ANSWER D) Parasagittal plane Rationale: The midsagittal (median) plane runs vertically through the midline, splitting the body into equal left and right halves. Parasagittal divides into unequal halves, frontal into anterior/posterior, transverse into superior/inferior. Homeostasis is best defined as: A) A constant internal environment with no fluctuations B) Maintenance of a relatively stable internal environment despite external changes CORRECT ANSWER C) The body’s ability to increase metabolic rate during exercise D) A feedback mechanism that always amplifies a stimulus
Rationale: Homeostasis involves dynamic equilibrium, not absolute constancy. Negative feedback loops maintain stability. Option B captures the essence; A is incorrect (fluctuations occur), C is a specific process, D describes positive feedback. Which organelle is responsible for ATP production? A) Ribosome B) Mitochondrion CORRECT ANSWER C) Golgi apparatus D) Lysosome Rationale: Mitochondria generate ATP via cellular respiration. Ribosomes synthesize proteins, Golgi modifies/packages proteins, lysosomes digest waste. A cell placed in a hypertonic solution will: A) Swell and possibly burst B) Shrink due to water leaving the cell CORRECT ANSWER C) Remain unchanged D) Undergo active transport of water Rationale: Hypertonic solution has higher solute concentration outside; water moves out via osmosis, causing crenation (shrinkage). Hypotonic causes swelling; isotonic no net movement. Which tissue type covers body surfaces and lines body cavities? A) Connective tissue B) Muscle tissue C) Nervous tissue D) Epithelial tissue CORRECT ANSWER Rationale: Epithelial tissue forms protective barriers, linings, and glands. Connective supports, muscle contracts, nervous conducts signals. Simple squamous epithelium is found in: A) Skin epidermis
The bone cell responsible for bone resorption is: A) Osteoblast B) Osteoclast CORRECT ANSWER C) Osteocyte D) Chondrocyte Rationale: Osteoclasts break down bone matrix (resorption). Osteoblasts build bone, osteocytes maintain, chondrocytes are cartilage cells. Which cranial bone contains the foramen magnum? A) Frontal bone B) Temporal bone C) Occipital bone CORRECT ANSWER D) Sphenoid bone Rationale: The occipital bone forms the posterior skull base; the foramen magnum allows spinal cord passage. Frontal (forehead), temporal (sides), sphenoid (keystone). The functional unit of a compact bone is the: A) Trabecula B) Osteon (Haversian system) CORRECT ANSWER C) Canaliculus D) Lamella Rationale: Osteons are cylindrical structures with concentric lamellae around central canals, providing strength. Trabeculae are in spongy bone; canaliculi connect lacunae. A suture is an example of a: A) Cartilaginous joint B) Fibrous joint CORRECT ANSWER C) Synovial joint D) Amphiarthrosis
Rationale: Sutures are immovable fibrous joints between skull bones. Cartilaginous (symphyses, synchondroses), synovial (freely movable), amphiarthrosis (slightly movable). Which type of muscle is striated and involuntary? A) Skeletal muscle B) Smooth muscle C) Cardiac muscle CORRECT ANSWER D) Multiunit smooth muscle Rationale: Cardiac muscle has striations and is under involuntary control (autonomic). Skeletal is voluntary striated, smooth is non-striated involuntary. The neurotransmitter released at the neuromuscular junction is: A) Norepinephrine B) Acetylcholine CORRECT ANSWER C) Dopamine D) Serotonin Rationale: Acetylcholine (Ache) is released from motor neuron terminals, binds to nicotinic receptors on sarcolemma, initiating muscle contraction. Norepinephrine is for sympathetic effectors. The sarcomere is defined as the region between: A) M line and H zone B) Z discs (Z lines) CORRECT ANSWER C) A bands D) I bands Rationale: Sarcomere is the basic contractile unit from one Z disc to the next. During contraction, Z discs move closer; A band length constant, I band shortens. Which of the following is an example of a first-class lever in the human body? A) Biceps brachia lifting a weight (elbow flexion) B) Head resting on the atlas (Atlanta-occipital joint) CORRECT ANSWER
During an action potential, voltage-gated sodium channels open during: A) Repolarization B) Depolarization CORRECT ANSWER C) Hyperpolarization D) Refractory period Rationale: Depolarization phase: sodium channels open, Na+ influx. Repolarization: potassium channels open, K+ efflux. Hyperpolarization: excessive K+ efflux. Which lobe of the cerebrum is primarily responsible for processing auditory information? A) Frontal lobe B) Parietal lobe C) Temporal lobe CORRECT ANSWER D) Occipital lobe Rationale: Temporal lobe houses primary auditory cortex (Herschel’s gyrus). Frontal (executive/motor), parietal (somatosensory), occipital (visual). The corpus callosum is a structure that: A) Produces cerebrospinal fluid B) Connects the left and right cerebral hemispheres CORRECT ANSWER C) Regulates body temperature D) Controls balance and coordination Rationale: Corpus callosum is a large commissural tract enabling interhemispheric communication. CSF produced by choroid plexus, temperature by hypothalamus, balance by cerebellum. Which part of the brainstem contains the cardiac and respiratory centers? A) Midbrain B) Pons C) Medulla oblongata CORRECT ANSWER D) Thalamus
Rationale: Medulla oblongata houses vital centers: cardiac (heart rate), respiratory (rhythm), vasomotor (blood pressure). Pons has pneumotaxic center, midbrain visual/auditory reflexes. The sympathetic nervous system is characterized by: A) Craniosacral outflow B) Thoracolumbar outflow and release of norepinephrine at effectors CORRECT ANSWER C) Long preganglionic fibers and short postganglionic fibers D) Primarily cholinergic postganglionic fibers Rationale: Sympathetic: thoracolumbar (T1-L2), short preganglionic, long postganglionic (except adrenal medulla), most postganglionic release norepinephrine (adrenergic). Parasympathetic: craniosacral, long preganglionic, short postganglionic, all cholinergic. Which hormone is released by the posterior pituitary? A) Growth hormone (GH) B) Antidiuretic hormone (ADH) CORRECT ANSWER C) Thyroid-stimulating hormone (TSH) D) Prolactin Rationale: Posterior pituitary stores and releases ADH (vasopressin) and oxytocin, which are synthesized in hypothalamus. Anterior pituitary produces GH, TSH, prolactin, etc. The thyroid gland requires which element to produce thyroid hormones? A) Calcium B) Iodine CORRECT ANSWER C) Iron D) Zinc Rationale: Iodine is incorporated into thyroglobulin to form T3 and T4. Deficiency leads to goiter and hypothyroidism. Which hormone lowers blood glucose levels? A) Glucagon
Which blood type is considered the universal recipient? A) Type A B) Type B C) Type O D) Type AB CORRECT ANSWER Rationale: Type AB has no anti-A or anti-B antibodies, so can receive A, B, AB, O. Type O is universal donor (no A/B antigens). The P wave on an electrocardiogram (ECG) represents: A) Ventricular depolarization B) Atrial depolarization CORRECT ANSWER C) Ventricular repolarization D) Atrial repolarization Rationale: P wave = atrial depolarization. QRS complex = ventricular depolarization (atrial repolarization hidden). T wave = ventricular repolarization. The second heart sound (“dub”) is caused by: A) Closure of atrioventricular valves B) Closure of semilunar valves CORRECT ANSWER C) Opening of atrioventricular valves D) Turbulent flow into the atria Rationale: S2 occurs at beginning of ventricular diastole when aortic and pulmonary valves close. S (“lob”) is AV valve closure. Which vessel carries deoxygenated blood from the heart to the lungs? A) Aorta B) Pulmonary trunk (artery) CORRECT ANSWER C) Pulmonary vein D) Superior vena cava
Rationale: Pulmonary artery (trunk) carries deoxygenated blood to lungs for oxygenation. Pulmonary veins return oxygenated blood to left atrium. The sinoatrial (SA) node is located in the: A) Left ventricle B) Right atrium CORRECT ANSWER C) Interventricular septum D) Left atrium Rationale: SA node (pacemaker) is in the right atrial wall near superior vena cava opening. It initiates action potentials. Which of the following increases cardiac output? A) Decreased heart rate B) Increased sympathetic stimulation CORRECT ANSWER C) Increased afterload D) Decreased venous return Rationale: Sympathetic stimulation increases heart rate and contractility, raising cardiac output (CO = HR × SV). Decreased HR or venous return reduces CO; increased afterload reduces stroke volume. The majority of carbon dioxide is transported in the blood as: A) Dissolved CO B) Carbaminohemoglobin C) Bicarbonate ions (HCO3-) CORRECT ANSWER D) Carbon monoxide Rationale: About 70% of CO2 is transported as bicarbonate (formed via carbonic anhydrase in RBCs). 20- 25% as carbaminohemoglobin, 5-10% dissolved. The inspiratory reserve volume (IRV) is defined as: A) Air left in lungs after maximal exhalation B) Air that can be forcefully inhaled beyond tidal volume CORRECT ANSWER
A) Heart B) Liver CORRECT ANSWER C) Kidneys D) Spleen Rationale: Portal vein transports nutrient-rich, toxin-containing blood to liver for processing before entering systemic circulation. This allows detoxification and regulation. Which segment of the nephron is the primary site of water reabsorption under ADH control? A) Proximal convoluted tubule B) Loop of Henle (descending limb) C) Collecting duct CORRECT ANSWER D) Distal convoluted tubule Rationale: ADH increases water permeability of collecting duct principal cells, allowing water reabsorption. Proximal tubule reabsorbs ~65% water constitutively; descending limb is permeable but not ADH-regulated. The glomerular filtration rate (GFR) is directly regulated by: A) Renin secretion from macula dense B) Afferent arteriole diameter changes CORRECT ANSWER C) Tubular secretion of hydrogen ions D) Aldosterone levels Rationale: GFR is regulated by adjusting afferent/efferent arteriole resistance (autoregulation, sympathetic, hormonal). Renin initiates RAAS affecting GFR indirectly; aldosterone affects Na+ reabsorption, not directly GFR. Which of the following is normally NOT found in urine? A) Urea B) Glucose CORRECT ANSWER C) Sodium D) Creatinine
Rationale: Glucose is fully reabsorbed in proximal tubule (via SGLT) if blood glucose below renal threshold (~180 mg/ld.). Glycosuria indicates diabetes or renal issue. Urea, sodium, creatinine is normal. The male gonad that produces sperm is the: A) Epididymis B) Testis CORRECT ANSWER C) Vas deferens D) Seminal vesicle Rationale: Testes produce sperm (spermatogenesis) and testosterone. Epididymis stores/matures sperm, vas deferens transports, seminal vesicles produce seminal fluid. The structure where fertilization typically occurs is the: A) Uterus B) Fallopian tube (ampulla) CORRECT ANSWER C) Ovary D) Cervix Rationale: Fertilization usually occurs in the ampulla of the uterine tube. Zygote then moves to uterus for implantation. Which hormone surge triggers ovulation? A) Follicle-stimulating hormone (FSH) B) Luteinizing hormone (LH) CORRECT ANSWER C) Progesterone D) Estrogen Rationale: Mid-cycle LH surge (from anterior pituitary) causes mature follicle to rupture and release oocyte. FSH promotes follicular growth, estrogen primes, progesterone supports luteal phase. The functional layer of the endometrium that is shed during menstruation is the: A) Basal layer B) Stratum functionalism CORRECT ANSWER
The type of joint that allows the greatest range of motion is a: A) Suture B) Synovial joint CORRECT ANSWER C) Syndesmosis D) Symphysis Rationale: Synovial joints (e.g., shoulder, knee) are freely movable (arthroses). Sutures (immovable), syndesmoses (slightly movable), symphyses (slightly movable). Which of the following is NOT a function of the skeletal system? A) Protection of organs B) Mineral storage C) Production of red blood cells in yellow marrow CORRECT ANSWER D) Leverage for movement Rationale: Red blood cells are produced in red bone marrow, not yellow marrow (which stores fat). The other options are correct functions. The region of a long bone where growth in length occurs is the: A) Periosteum B) Epiphyseal plate CORRECT ANSWER C) Medullary cavity D) Articular cartilage Rationale: Epiphyseal plate (growth plate) is hyaline cartilage between diaphysis and epiphysis; ossification here increases length. Periosteum covers bone, medullary cavity contains marrow. Which of the following is a characteristic of smooth muscle? A) Multi-nucleated cells B) Lacks striations and is under involuntary control CORRECT ANSWER C) Contains troponin D) Rapid contraction and relaxation
Rationale: Smooth muscle is non-striated, involuntary (autonomic/ hormonal), single nucleus, lacks troponin (uses calmodulin). Skeletal is multi-nucleated, striated, voluntary. The primary motor cortex is located in which gyrus? A) Postcentral gyrus B) Precentral gyrus CORRECT ANSWER C) Superior temporal gyrus D) Cingulate gyrus Rationale: Precentral gyrus (frontal lobe) is primary motor cortex (Bradman area 4). Postcentral is primary somatosensory cortex. Damage to the left Boca’s area would most likely result in: A) Inability to understand spoken language B) Difficulty producing fluent speech (expressive aphasia) CORRECT ANSWER C) Loss of visual recognition D) Impaired balance Rationale: Boca’s area (frontal lobe) coordinates speech production; damage causes non-fluent aphasia. Wernicke’s area damage causes receptive aphasia. The blood-brain barrier is primarily formed by: A) Microglia B) Tight junctions between capillary endothelial cells CORRECT ANSWER C) Oligodendrocytes D) Astrocytes Rationale: Tight junctions of brain capillary endothelial cells restrict par acellular passage. Astrocytes induce and maintain the barrier but are not the structural component. Which cranial nerve is responsible for vision? A) Olfactory (I) B) Optic (II) CORRECT ANSWER
A) Iron-deficiency anemia B) Pernicious anemia CORRECT ANSWER C) Sickle cell anemia D) Aplastic anemia Rationale: Vitamin B12 deficiency impairs DNA synthesis, causing megaloblastic (pernicious) anemia due to lack of intrinsic factor or dietary deficiency. Iron deficiency = microcytic, sickle cell = genetic, aplastic = bone marrow failure. The universal donor of packed red blood cells is: A) Type AB B) Type O negative CORRECT ANSWER C) Type A positive D) Type B positive Rationale: Type O negative RBCs lack A/B antigens and Rh factor, so no reaction in most recipients. O negative is “universal donor” for RBCs; AB positive is universal plasma donor. Which white blood cell releases histamine during an allergic reaction? A) Neutrophil B) Basophil CORRECT ANSWER C) Lymphocyte D) Monocyte Rationale: Basophils (and mast cells) release histamine, heparin, and other mediators of inflammation and allergy. Eosinophils combat parasites, neutrophils bacteria. The plateau phase of the cardiac action potential is due to: A) Rapid sodium influx B) Calcium influx through L-type channels CORRECT ANSWER C) Potassium efflux D) Chloride influx
Rationale: In ventricular myocytes, calcium entry through L-type channels balances potassium efflux, creating a plateau that prolongs depolarization and prevents tetanus. Which valve prevents backflow from the left ventricle into the left atrium? A) Pulmonary valve B) Mitral (bicuspid) valve CORRECT ANSWER C) Tricuspid valve D) Aortic valve Rationale: Mitral valve (left AV valve) closes during ventricular systole to prevent backflow into left atrium. Tricuspid is right AV valve, aortic/pulmonary are semilunar. The structure that conducts electrical impulses from the AV node to the ventricles is the: A) Bachmann’s bundle B) Bundle of His (atrioventricular bundle) CORRECT ANSWER C) Purkinje fibers D) Intermodal pathways Rationale: Bundle of His (AV bundle) is the only electrical connection between atria and ventricles; it divides into bundle branches and Purkinje fibers. Intermodal pathways conduct to AV node. Which of the following decreases blood pressure? A) Angiotensin II B) Atrial natriuretic peptide (ANP) CORRECT ANSWER C) Norepinephrine D) Aldosterone Rationale: ANP, released from atrial stretch, causes vasodilation and natriuretic, lowering blood pressure. Angiotensin II, norepinephrine, aldosterone increase BP. The partial pressure of oxygen (PaO2) in systemic arterial blood is approximately: A) 40 mmHg B) 95 mmHg CORRECT ANSWER
