ITEC Anatomy & Physiology common mistakes
ITEC Anatomy & Physiology · Understand the traps and how to avoid them.
When asked to identify a tissue type from a written description, the candidate names the organ the tissue is found in (e.g., answers "lung" or "kidney") instead of naming the tissue category (e.g., "simple squamous epithelium").
Candidates revise by organ system and memorise where tissues sit, so a description triggers an organ association rather than a classification decision. Written descriptions also lack the visual cue of a slide, so candidates fall back on the most familiar word in the stem.
What to do instead
Practise a four-step classification drill on written descriptions only: (1) how many cell layers, (2) cell shape, (3) apical surface specialisations, (4) extracellular matrix dominant or cells dominant. Write the answer as a tissue name first, then add one example organ as a check, never as the answer.
On bone growth questions, the candidate states that the epiphyseal plate adds bone on its diaphyseal side only, or confuses appositional growth with interstitial growth, and so gets the direction and the resulting change in bone shape wrong.
The two growth modes are taught together and both involve cartilage or osteoblast activity, so the mechanisms blur. Candidates also memorise "plate closes at puberty" without linking closure to the loss of lengthwise growth.
What to do instead
Build a two-column table: interstitial (length, epiphyseal plate, cartilage replaced by bone on the diaphyseal side, plate thins then closes) versus appositional (width, osteoblasts under periosteum, osteoclasts on endosteal surface). For each, state what happens to length, width and medullary cavity, and rehearse the consequence of plate closure in one sentence.
When asked which muscle action occurs at a joint, the candidate names the muscle that is most visually obvious or largest rather than the prime mover, and lists synergists and antagonists as if they all performed the same action.
Muscle names are learned as a list attached to a region, without a functional grouping. Candidates also conflate origin and insertion, so they cannot reason about which end moves and therefore which action results.
What to do instead
For each major joint, write the action, then the prime mover, then one antagonist and one synergist, and justify each with origin, insertion and the line of pull. Rehearse the rule that the insertion moves toward the origin, and check every answer by asking which bone is being pulled in which direction.
On cardiac cycle questions, the candidate assigns valve states to the wrong phase, for example saying the atrioventricular valves are open during ventricular ejection, or treats systole and diastole as atrial events only.
The cycle is learned as a sequence of pressure numbers without linking each pressure change to the valve it opens or closes. Candidates also mix up the terms systole and diastole as generic contraction and relaxation rather than chamber-specific events.
What to do instead
Draw the cycle as four pressure-driven steps and annotate valve states at each: filling (AV open, semilunar closed), isovolumetric contraction (both closed), ejection (semilunar open, AV closed), isovolumetric relaxation (both closed). State explicitly that valves open and close passively in response to pressure gradients, and label every phase as atrial or ventricular.
The candidate describes gas exchange as "oxygen goes in and carbon dioxide goes out" without naming the partial pressure gradient, the membrane crossed, or the direction of diffusion at the alveolus versus the tissue capillary.
Everyday language about breathing is substituted for the physiological mechanism, and candidates do not distinguish ventilation (bulk flow) from diffusion (gradient-driven exchange).
What to do instead
Write the pathway as a chain with a gradient at each step: atmospheric to alveolar partial pressure, alveolar to pulmonary capillary blood, blood to tissue fluid, tissue fluid to cell. For each step state the direction and the driving gradient, and separately define ventilation, external respiration and internal respiration so the terms are not used interchangeably.
When asked where a nutrient is digested or absorbed, the candidate gives a single site (usually the stomach or small intestine) rather than the specific region and the enzyme or transporter involved, and misplaces bile and pancreatic enzyme function.
Digestion is revised as a list of enzymes with no map of where each acts, and bile is often described as an enzyme because it is listed alongside lipase.
What to do instead
Build a table with rows for carbohydrate, protein, fat and nucleic acid, and columns for mouth, stomach, duodenum, jejunum/ileum and brush border, naming the enzyme or emulsifier and the absorbed product in each cell. Add a separate note that bile emulsifies fat mechanically and contains no digestive enzymes.
The candidate confuses the roles of the nervous and endocrine systems in a control loop, for example describing insulin as a neurotransmitter or treating a reflex arc as a hormone cascade, and cannot say which system provides rapid short-lived versus slower sustained responses.
Both systems are taught as signalling systems using similar vocabulary (receptor, signal, target), and candidates learn them in separate blocks without a shared control-loop template.
What to do instead
Use one control-loop template for every example: stimulus, sensor, control centre, signal pathway, effector, response, negative feedback. Fill it once with a reflex (e.g., baroreceptor response) and once with a hormone (e.g., blood glucose), then compare speed, duration, pathway and target specificity side by side.
On skin questions, the candidate places a structure in the wrong layer, for example putting sebaceous glands, sweat gland coils or hair follicles in the epidermis, or saying the epidermis contains blood vessels.
Diagrams show all skin structures in one cross-section, so the layer boundaries are not reinforced, and the epidermis is assumed to be a full-thickness living tissue rather than a thin avascular keratinised layer.
What to do instead
Learn one rule and apply it repeatedly: the epidermis is avascular epithelium with no glands, follicles or blood vessels; all glands, follicles, vessels and nerve endings sit in the dermis or hypodermis and reach the surface by ducts or shafts. Test yourself by sorting a list of ten structures into layers and justifying each with the avascularity rule.
The candidate mixes up filtration, reabsorption and secretion in the nephron, or describes urine concentration without linking it to the loop of Henle and ADH, and confuses the roles of the reproductive ducts and glands.
The three renal processes are defined with similar wording and all involve movement across tubule epithelium, and the countercurrent mechanism is learned as a label rather than a mechanism.
What to do instead
For each nephron segment, write what moves, in which direction, and whether it is filtration, reabsorption or secretion, then add the hormone that regulates that segment. For concentration, trace the gradient from loop of Henle to collecting duct and state what ADH changes and where.
When asked how a disturbance is corrected, the candidate describes the response but omits the negative feedback step that restores the set point, or names the effector as the sensor, so the loop is left open.
Homeostasis is revised as a definition rather than as a working loop, and candidates are used to naming the organ involved rather than its role in the sequence.
What to do instead
Rehearse a fixed five-part sentence for every example: the variable moves away from the set point, the sensor detects it, the control centre compares it, the effector responds, the variable returns toward the set point. Then state one example where the loop is positive rather than negative, and explain why it still ends.