CHT Anatomy & Physiology Fundamentals 2

Question 1

Which cellular organelle is primarily responsible for aerobic ATP production and is most directly affected by oxygen availability in hyperbaric therapy?

Accepted Answer

Mitochondria

Answer

Mitochondria perform oxidative phosphorylation to produce ATP, a process that depends on adequate oxygen supply.

Question 2

The blood-brain barrier is primarily formed by which cell type surrounding cerebral capillaries?

Accepted Answer

Astrocytes

Answer

Astrocyte end-feet wrap around cerebral capillaries and contribute to tight junction formation, creating the blood-brain barrier.

Question 3

During hyperbaric oxygen therapy, oxygen delivery to tissues is enhanced because dissolved plasma oxygen bypasses which normal physiological limiting factor?

Accepted Answer

Hemoglobin oxygen-carrying capacity

Answer

HBOT increases dissolved plasma O₂ so tissue oxygenation continues even when hemoglobin is saturated or unavailable (e.g., CO poisoning, anemia).

Question 4

Which anatomical structure separates the right and left ventricles and, if defective, can cause paradoxical gas embolism in hyperbaric patients?

Accepted Answer

Patent foramen ovale

Answer

A patent foramen ovale (PFO) allows venous gas emboli to cross directly into arterial circulation, causing paradoxical arterial gas embolism.

Question 5

The Hering-Breuer reflex, which prevents lung over-inflation, is mediated by stretch receptors located in which structure?

Accepted Answer

Bronchial smooth muscle and lung parenchyma

Answer

Pulmonary stretch receptors in the airways and lung parenchyma send inhibitory signals via the vagus nerve to stop inspiration when lungs are sufficiently inflated.

(CHT) Certified Hyperbaric Technician Practice Test

(CHT) Certified Hyperbaric Technician Practice Test

CHT Anatomy & Physiology Fundamentals 2