Section 5.5: Body Systems for the Utah CNA
Key Takeaways
- Utah's UNAR written exam includes seven Body Systems questions; CNAs observe and report changes—they do not diagnose disease.
- Integumentary and musculoskeletal changes (thin skin, pressure risk, weaker bones/joints) raise fall and skin-breakdown risk during ADLs.
- Cardiovascular and respiratory warning signs—chest pain, sudden edema, dyspnea, cyanosis, or abnormal breathing sounds—require immediate nurse notification.
- Digestive and urinary red flags include melena, hematuria, foul urine, constipation, diarrhea, and sudden appetite or voiding changes.
- Nervous-system changes such as sudden confusion, slurred speech, one-sided weakness, or new dizziness are urgent safety findings, not routine observations.
Body Systems for the Utah CNA
The Utah Nursing Assistant Registry (UNAR) written exam includes a dedicated Body Systems subject area (7 of 75 questions). You are not expected to diagnose illness or explain complex pathophysiology. Your job is to know how each major system normally works at a practical level, recognize common age-related changes, observe safety and ADL effects, and report abnormal findings promptly to the licensed nurse.
Think of body-system knowledge as a map for observation: every bath, meal, transfer, and vital-sign check is a chance to notice whether skin, heart, lungs, gut, bladder, bones, or nerves are changing from the resident's baseline.
How CNAs Use Body-System Knowledge
- Observe color, temperature, movement, breathing, appetite, voiding, and mentation during care.
- Compare what you see today with the resident's usual pattern.
- Report facts—location, time, vital signs, and resident statements—without labeling a medical diagnosis.
- Protect safety: many system changes increase fall risk, aspiration risk, pressure injury risk, or confusion.
| Body System | Normal CNA Cues | Common Age-Related Changes | Priority Reports |
|---|---|---|---|
| Integumentary | Intact, warm, dry skin; pink nail beds | Thinner skin, less fat padding, slower healing | New redness over bony areas, open areas, bruising, rash |
| Musculoskeletal | Steady gait, adequate ROM for ADLs | Weaker muscles, stiffer joints, bone loss | Sudden inability to bear weight, new deformity, severe joint pain |
| Cardiovascular | Warm extremities; pulse 60–100; no sudden edema | Stiffer vessels, orthostatic risk, slower recovery | Chest pain, sudden swelling, cold/blue extremities, irregular pulse |
| Respiratory | Quiet breathing 12–20/min; pink lips | Shallower breaths, weaker cough | Dyspnea, cyanosis, wheezing, productive cough change |
| Digestive | Regular soft brown stool; adequate intake | Slower digestion, constipation risk | Melena, vomiting, severe abdominal pain, refusal to eat |
| Urinary | Pale yellow clear urine; continent or known pattern | Smaller bladder capacity; UTI risk | Hematuria, burning, foul odor, sudden incontinence |
| Nervous | Alert to person/place/time; clear speech | Slower reaction time; sensory decline | Sudden confusion, slurred speech, one-sided weakness |
Integumentary System (Skin, Hair, Nails)
The integumentary system is the body's first barrier against infection and injury. Normal skin is intact, appropriately warm, and free of open areas. With aging, skin thins, oil production decreases, and subcutaneous fat lessens—so friction, shear, and pressure during bed mobility or transfers can cause injury faster.
CNA Observation Focus
- Check pressure points (heels, sacrum, hips, elbows, ears) during bathing, turning, and dressing.
- Report non-blanchable redness, warmth, blistering, drainage, new bruises, or unexplained skin tears immediately.
- Keep skin clean and dry; avoid dragging residents across sheets; use lift sheets and follow the turning schedule.
- Dry, cracked skin or brittle nails can signal poor circulation or nutrition—document and notify the nurse rather than diagnosing the cause.
ADL/safety link: Fragile skin makes careful hygiene, moisture control, and positioning central to preventing pressure injuries and infection.
Musculoskeletal System (Bones, Muscles, Joints)
This system supports movement, posture, and protection of organs. Age-related muscle loss (sarcopenia), joint stiffness, and osteoporosis increase fall and fracture risk. Many residents need pacing, assistive devices, and range-of-motion support to stay as independent as possible.
CNA Observation Focus
- Notice gait changes, limping, new weakness, or refusal to stand.
- Report sudden pain after a fall, shortening/rotation of a leg (possible hip fracture), or swelling of a joint.
- Support safe ADLs with proper body mechanics, gait belts, and ordered mobility aids—never force a joint past resistance.
- Encourage activity within the care plan; immobility worsens stiffness and pressure risk.
ADL/safety link: Dressing, toileting, and transfers all depend on musculoskeletal strength and balance. Report fatigue or dizziness before a fall occurs.
Cardiovascular System (Heart & Blood Vessels)
The heart pumps oxygenated blood through vessels to organs and tissues. Aging vessels may stiffen, making hypertension and orthostatic hypotension more common. Poor circulation can leave feet cool, pale, or swollen.
CNA Observation Focus
- Report chest pain/pressure, sudden shortness of breath, new or worsening edema in legs/ankles, cyanosis, or a pulse that is newly irregular, below 60, or above 100.
- When assisting a resident to stand, allow dangling at the bedside to reduce orthostatic dizziness and falls.
- Note cold, pale, or bluish extremities and report them; do not massage swollen or reddened calves.
ADL/safety link: Cardiovascular changes often appear during exertion—walking to the bathroom, bathing, or transferring. Pace care and report intolerance promptly.
Respiratory System (Lungs & Airways)
Respiration moves oxygen in and carbon dioxide out. Older adults may have a weaker cough and shallower breaths, so mucus and infection clear less efficiently. Normal adult rate remains 12–20 breaths per minute with quiet, effortless breathing.
CNA Observation Focus
- Report dyspnea, noisy breathing (wheeze, gurgling), use of accessory muscles, cyanosis of lips/nail beds, or a cough that produces new/changed sputum.
- Position residents upright for meals when ordered; elevate the head of the bed as directed for comfort and safer breathing.
- Encourage deep breathing and activity within the care plan; report oxygen tubing displacement or nasal cannula issues to the nurse (CNAs do not adjust oxygen flow unless facility policy and training specifically allow).
ADL/safety link: Eating, bathing, and talking increase oxygen demand. Stop care and call the nurse if the resident cannot catch their breath.
Digestive System (GI Tract)
The digestive system breaks down food and eliminates waste. Aging often slows motility, increasing constipation risk—especially with low fluid intake, low fiber, or immobility. Appetite may decline, so intake/output and weight trends matter.
CNA Observation Focus
- Report nausea, vomiting, severe abdominal pain/distention, black tarry stools (melena), bright-red blood in stool, or no bowel movement beyond the facility's reportable timeframe.
- Offer fluids and fiber-rich foods as allowed; position upright for meals to reduce aspiration risk.
- Document percent of meals eaten and any swallowing difficulty (coughing, pocketing food) for the nurse.
ADL/safety link: Feeding assistance and toileting schedules support GI comfort and dignity while catching bleeding or obstruction early.
Urinary System (Kidneys & Bladder)
Kidneys filter waste; the bladder stores and empties urine. Aging reduces bladder capacity and increases nighttime voiding and UTI risk. Dehydration worsens confusion—especially in older adults.
CNA Observation Focus
- Normal urine is pale yellow, clear, and mild-smelling. Report hematuria, cloudy/foul urine, burning, frequency, urgency, sudden incontinence, or little/no urine output.
- Measure and record output accurately when ordered; keep catheter tubing unkinked and the drainage bag below bladder level.
- Offer toileting assistance on schedule to prevent urgency-related falls.
ADL/safety link: Rushing to the bathroom is a major fall trigger. Anticipate needs and keep pathways clear.
Nervous System (Brain, Spinal Cord, Nerves)
The nervous system controls thought, sensation, and voluntary movement. Age-related slowing of reflexes and sensory decline (vision/hearing) raise safety risk. Sudden neurologic change is never "just aging."
CNA Observation Focus
- Report sudden confusion, facial droop, slurred speech, one-sided weakness/numbness, severe headache, new seizure activity, or unresponsiveness—these are emergency findings.
- Note baseline dementia behaviors versus acute change; a UTI, hypoxia, or medication effect can cause sudden worsening.
- Protect safety with clear communication, adequate lighting, call-light access, and fall precautions.
ADL/safety link: Nervous-system impairment affects every ADL—feeding, dressing, transfers, and toileting. Match assistance level to the care plan and report new deficits immediately.
Putting It Together for the Exam and the Floor
Body-systems questions on the Utah CNA exam usually test whether you can recognize a change and choose the safest CNA response: observe, support ADLs/safety, and report—not diagnose or independently treat. When any system shows sudden change from baseline, stay with the resident if unsafe, call the nurse, and document objective facts.
A CNA notices a reddened area over a resident's sacrum that does not lighten when gently pressed. What is the correct CNA action?
Which observation related to the cardiovascular system should the nursing assistant report to the nurse immediately?
An older resident who is usually oriented suddenly becomes confused and has foul-smelling, cloudy urine. Which body systems are most directly involved in what the CNA should report?