WGU C458 Health, Fitness, and Wellness: (Latest 2026/2027 Update)
Anatomy, Pathophysiology, CPR, Nutrition & SEL | Q&A | Grade A |
100% Correct (Verified Answers) – WGU
Subject: Health, Fitness and Wellness – Immune System, Body Systems, Cardiovascular Risk,
CPR, Sleep, Nutrition, Social Emotional Learning
Source: WGU C458 Comprehensive Exam Blueprint
Format: Q&A Guide with Clinical & Behavioral Rationale | 100% Verified
1: Which immune system structure is the site where white blood cells gain the ability to
chemically identify specific foreign agents?
Correct Answer: Thymus gland
1. The thymus is where T-lymphocytes mature and undergo positive/negative selection, enabling
recognition of self vs. non-self antigens.
2. T-cells gain specific antigen receptors (TCRs) that identify foreign agents. Thymic atrophy with
age reduces immune function.
3. Wrong answer: Bone marrow produces WBCs but does not complete T-cell education; that
occurs in thymus.
2: The body system forms a protective barrier
Correct Answer: Integumentary system
1. Skin, hair, nails form mechanical barrier against pathogens, UV radiation, and chemical injury.
2. Stratified squamous epithelium with keratin provides waterproofing and microbial defense.
3. Breaks in skin integrity (wounds, burns) increase infection risk.
3: The body system that regulates body temperature
Correct Answer: Both integumentary and central nervous system
1. Hypothalamus (CNS) acts as thermostat; integumentary system effectors: sweat glands and
vasodilation/vasoconstriction.
2. CNS detects temperature changes; skin regulates heat loss via evaporation and blood flow.
3. Impaired thermoregulation occurs in spinal cord injury or anhidrosis.
4: The body system that controls blood pressure
Correct Answer: Central nervous system
1. Medulla oblongata (CNS) regulates BP via autonomic nervous system: baroreceptor reflex
adjusts heart rate and vessel tone.
2. Sympathetic outflow increases BP; parasympathetic lowers HR. Wrong answer: cardiovascular
system is the effector, not controller.
, 5: The body system that regulates thirst and hunger
Correct Answer: Central nervous system
1. Hypothalamus contains thirst center (osmoreceptors) and hunger center (regulated by ghrelin,
leptin, glucose sensing).
2. Damage to hypothalamic nuclei causes adipsia or hyperphagia. Wrong answer: digestive
system processes intake but does not regulate drive.
6: The body system that regulates muscle coordination
Correct Answer: Central nervous system
1. Cerebellum (CNS) coordinates voluntary movement, balance, and motor learning via feedback
loops.
2. Basal ganglia and motor cortex also contribute. Ataxia results from cerebellar dysfunction.
7: A postmenopausal female with BMI 33, smokes 2 packs/day, exercises rarely, found a
small breast lump. Which two health conditions are of concern?
Correct Answer: Cancer & Cardiovascular disease
1. Smoking + obesity + sedentary lifestyle increase breast cancer risk (estrogen exposure) and
CVD (atherosclerosis, hypertension).
2. Postmenopausal status further increases CVD risk. The lump requires prompt biopsy.
8: A sanitation worker had headache, fever, fatigue, stiff joints, nausea, vomiting, diarrhea
→ hepatitis A. Which approach prevents this infection?
Correct Answer: Getting a vaccination
1. Hepatitis A vaccine (2-dose series) provides active immunity; HAV is fecal-oral transmitted,
common in sanitation workers.
2. Hand hygiene helps but vaccine is definitive prevention. Wrong answer: antibiotics are
ineffective against viruses.
9: Adult one-rescuer CPR
Correct Answer: Dial 911 and get Automated External Defibrillator (AED) if available
1. AHA guidelines: adult CPR sequence — check responsiveness, call 911, get AED, start
compressions (30:2 ratio).
2. Early defibrillation improves survival in shockable rhythms (VF/pVT). Hands-only CPR if
untrained.
10: Adult foreign-body airway obstruction
Correct Answer: Use abdominal thrusts (Heimlich maneuver)
1. Abdominal thrusts create subdiaphragmatic pressure to expel foreign object from airway.
2. For obese or pregnant, use chest thrusts. If victim becomes unconscious, start CPR and check
mouth for object.
Anatomy, Pathophysiology, CPR, Nutrition & SEL | Q&A | Grade A |
100% Correct (Verified Answers) – WGU
Subject: Health, Fitness and Wellness – Immune System, Body Systems, Cardiovascular Risk,
CPR, Sleep, Nutrition, Social Emotional Learning
Source: WGU C458 Comprehensive Exam Blueprint
Format: Q&A Guide with Clinical & Behavioral Rationale | 100% Verified
1: Which immune system structure is the site where white blood cells gain the ability to
chemically identify specific foreign agents?
Correct Answer: Thymus gland
1. The thymus is where T-lymphocytes mature and undergo positive/negative selection, enabling
recognition of self vs. non-self antigens.
2. T-cells gain specific antigen receptors (TCRs) that identify foreign agents. Thymic atrophy with
age reduces immune function.
3. Wrong answer: Bone marrow produces WBCs but does not complete T-cell education; that
occurs in thymus.
2: The body system forms a protective barrier
Correct Answer: Integumentary system
1. Skin, hair, nails form mechanical barrier against pathogens, UV radiation, and chemical injury.
2. Stratified squamous epithelium with keratin provides waterproofing and microbial defense.
3. Breaks in skin integrity (wounds, burns) increase infection risk.
3: The body system that regulates body temperature
Correct Answer: Both integumentary and central nervous system
1. Hypothalamus (CNS) acts as thermostat; integumentary system effectors: sweat glands and
vasodilation/vasoconstriction.
2. CNS detects temperature changes; skin regulates heat loss via evaporation and blood flow.
3. Impaired thermoregulation occurs in spinal cord injury or anhidrosis.
4: The body system that controls blood pressure
Correct Answer: Central nervous system
1. Medulla oblongata (CNS) regulates BP via autonomic nervous system: baroreceptor reflex
adjusts heart rate and vessel tone.
2. Sympathetic outflow increases BP; parasympathetic lowers HR. Wrong answer: cardiovascular
system is the effector, not controller.
, 5: The body system that regulates thirst and hunger
Correct Answer: Central nervous system
1. Hypothalamus contains thirst center (osmoreceptors) and hunger center (regulated by ghrelin,
leptin, glucose sensing).
2. Damage to hypothalamic nuclei causes adipsia or hyperphagia. Wrong answer: digestive
system processes intake but does not regulate drive.
6: The body system that regulates muscle coordination
Correct Answer: Central nervous system
1. Cerebellum (CNS) coordinates voluntary movement, balance, and motor learning via feedback
loops.
2. Basal ganglia and motor cortex also contribute. Ataxia results from cerebellar dysfunction.
7: A postmenopausal female with BMI 33, smokes 2 packs/day, exercises rarely, found a
small breast lump. Which two health conditions are of concern?
Correct Answer: Cancer & Cardiovascular disease
1. Smoking + obesity + sedentary lifestyle increase breast cancer risk (estrogen exposure) and
CVD (atherosclerosis, hypertension).
2. Postmenopausal status further increases CVD risk. The lump requires prompt biopsy.
8: A sanitation worker had headache, fever, fatigue, stiff joints, nausea, vomiting, diarrhea
→ hepatitis A. Which approach prevents this infection?
Correct Answer: Getting a vaccination
1. Hepatitis A vaccine (2-dose series) provides active immunity; HAV is fecal-oral transmitted,
common in sanitation workers.
2. Hand hygiene helps but vaccine is definitive prevention. Wrong answer: antibiotics are
ineffective against viruses.
9: Adult one-rescuer CPR
Correct Answer: Dial 911 and get Automated External Defibrillator (AED) if available
1. AHA guidelines: adult CPR sequence — check responsiveness, call 911, get AED, start
compressions (30:2 ratio).
2. Early defibrillation improves survival in shockable rhythms (VF/pVT). Hands-only CPR if
untrained.
10: Adult foreign-body airway obstruction
Correct Answer: Use abdominal thrusts (Heimlich maneuver)
1. Abdominal thrusts create subdiaphragmatic pressure to expel foreign object from airway.
2. For obese or pregnant, use chest thrusts. If victim becomes unconscious, start CPR and check
mouth for object.
