CHT Anatomy & Physiology Fundamentals 3

Question 1

Which principle describes how gas molecules dissolve in a liquid in proportion to their partial pressure, directly underlying the physics of HBOT tissue oxygenation?

Accepted Answer

Henry's Law

Answer

Henry's Law states that the amount of gas dissolved in a liquid is proportional to its partial pressure, explaining increased plasma oxygen dissolution at hyperbaric pressures.

Question 2

The carotid bodies, which are chemoreceptors monitoring arterial oxygen levels, are located at the bifurcation of which artery?

Accepted Answer

Common carotid artery

Answer

Carotid bodies sit at the bifurcation of the common carotid artery into internal and external branches, sampling arterial blood for O₂, CO₂, and pH.

Question 3

During compression in a hyperbaric chamber, middle ear barotrauma most commonly results from failure of which structure to equalize pressure?

Accepted Answer

Eustachian tube

Answer

The Eustachian tube connects the middle ear to the nasopharynx and must open to equalize pressure during compression; dysfunction leads to barotrauma.

Question 4

Myelin sheaths, which increase conduction velocity of nerve impulses, are produced in the peripheral nervous system by which cell type?

Accepted Answer

Schwann cells

Answer

Schwann cells wrap around peripheral nerve axons to form the myelin sheath; oligodendrocytes perform the equivalent function in the CNS.

Question 5

The alveolar-arterial (A-a) oxygen gradient is used clinically to assess gas exchange efficiency. Under hyperbaric conditions at 2.4 ATA breathing 100% O₂, the alveolar PO₂ would be approximately:

Accepted Answer

1,680 mmHg

Answer

At 2.4 ATA, total pressure is ~1,824 mmHg; breathing 100% O₂ and subtracting water vapor (~47) and CO₂ (~40) gives an alveolar PO₂ of roughly 1,737 mmHg, approximated as ~1,680 mmHg in clinical tables.

(CHT) Certified Hyperbaric Technician Practice Test

(CHT) Certified Hyperbaric Technician Practice Test

CHT Anatomy & Physiology Fundamentals 3