Anatomy & Physiology for the Biomedical Equipment Technician
Why it matters
Every device you service is attached to a living system, so questions test whether you can connect a measurement or therapy to the organ system that produces it. Expect to know, at a functional level: integumentary, musculoskeletal, nervous, endocrine, cardiovascular, lymphatic/immune, respiratory, digestive, urinary, and reproductive systems, plus the special senses.
Core concepts to master
- Homeostasis and negative feedback - the body holds pH, temperature, glucose, and electrolytes in range; devices (infusion pumps, ventilators, dialysis machines) either support or perturb those loops.
- Directional and regional terminology - anterior/posterior, superior/inferior, proximal/distal, medial/lateral, and the body cavities. Exams use these to describe electrode or transducer placement.
- Cardiopulmonary physiology - cardiac conduction (SA node → AV node → bundle of His → Purkinje), the P-QRS-T sequence, stroke volume × heart rate = cardiac output, and gas exchange at the alveoli. This underpins ECG, SpO2, capnography, and ventilator questions.
- Electrolytes and the action potential - sodium, potassium, calcium, and chloride gradients explain why the heart is electrically irritable and why leakage current matters.
- Renal and fluid balance - filtration, urine output, and how dialysis replaces it.
Traps
Questions swap anatomy (structure) with physiology (function); confuse the endocrine and exocrine pancreas; or ask which vessel carries oxygenated blood (pulmonary veins, not arteries). Watch for “which system” items where two answers seem plausible.
Rule of thumb
Form follows function, and function points to a device. When a question names a measurement (e.g., tidal volume), trace it to the system (respiratory) and then to the device (ventilator). If you can name the organ, the parameter, and the therapy, you can usually eliminate three options.
Worked example
“A patient’s SA node fails but the AV node still fires. What happens?” The AV node paces at its own slower intrinsic rate, so the ECG shows a slower rhythm with normal QRS complexes - a junctional rhythm, not asystole.