SHS Anatomy & Physiology Fundamentals 3 — Questions and Answers
Question 1: The alveoli in the lungs are significant for occupational health because they are the site of:
- Oxygen storage for exertion
- Gas exchange between air and blood (Correct answer)
- Mucus production to trap particles
- Immune cell production
Correct answer: Gas exchange between air and blood
Alveoli are thin-walled sacs where oxygen diffuses into the bloodstream and CO2 diffuses out, making them the primary target of inhaled occupational hazards.
Question 2: Which organ is the primary site for Phase I and Phase II detoxification of occupational chemical hazards?
- Kidney
- Spleen
- Liver (Correct answer)
- Lung
Correct answer: Liver
The liver metabolizes toxic chemicals through Phase I (oxidation/reduction) and Phase II (conjugation) reactions, converting them into water-soluble compounds for excretion.
Question 3: A worker with silicosis would show fibrotic changes primarily in which anatomical structure?
- Pleura
- Bronchi
- Alveolar walls (Correct answer)
- Trachea
Correct answer: Alveolar walls
Silica particles deposited in the alveoli trigger an inflammatory response leading to progressive fibrosis of the alveolar walls, reducing gas exchange capacity.
Question 4: What is the role of erythrocytes (red blood cells) in the context of carbon monoxide poisoning?
- They swell and block capillaries reducing oxygen delivery
- Hemoglobin binds CO with greater affinity than O2, preventing oxygen transport (Correct answer)
- They are destroyed by CO, causing anemia
- They release CO2 instead of O2 to tissues
Correct answer: Hemoglobin binds CO with greater affinity than O2, preventing oxygen transport
Carbon monoxide binds to hemoglobin with approximately 240 times greater affinity than oxygen, forming carboxyhemoglobin and drastically reducing oxygen-carrying capacity.
Question 5: In assessing musculoskeletal disorders, which joint type allows the widest range of motion and is most susceptible to workplace rotator cuff injuries?
- Hinge joint
- Pivot joint
- Ball-and-socket joint (Correct answer)
- Saddle joint
Correct answer: Ball-and-socket joint
Ball-and-socket joints, such as the shoulder, permit multiaxial movement but sacrifice stability, making them prone to rotator cuff tears in overhead work tasks.
Question 6: Which physiological mechanism explains why workers experience heat exhaustion when sweating heavily in a hot environment?
- Increased metabolic rate raises core temperature irreversibly
- Excessive fluid and electrolyte loss reduces plasma volume and cardiac output (Correct answer)
- Vasoconstriction prevents heat dissipation from the skin
- The hypothalamus stops regulating body temperature above 37°C
Correct answer: Excessive fluid and electrolyte loss reduces plasma volume and cardiac output
Profuse sweating depletes blood volume and electrolytes, reducing venous return and cardiac output, which leads to circulatory insufficiency characteristic of heat exhaustion.
Question 7: The lymphatic system contributes to occupational health protection primarily by:
- Producing red blood cells to replace those damaged by toxins
- Removing interstitial fluid and supporting immune surveillance against pathogens (Correct answer)
- Regulating blood glucose after chemical ingestion
- Filtering airborne particles before they reach the lungs
Correct answer: Removing interstitial fluid and supporting immune surveillance against pathogens
Lymph vessels drain excess tissue fluid and transport immune cells that identify and respond to pathogens and foreign substances encountered in the workplace.
SHS Anatomy & Physiology Fundamentals 3
The alveoli in the lungs are significant for occupational health because they are the site of: