Which of the following statements regarding oxygenation and ventilation is correct? select one: a. oxygenation is the movement of air into and out of the lungs, whereas ventilation is the exchange of gases. b. oxygenation without adequate ventilation can occur in climbers who quickly ascend to an altitude of lower atmospheric pressure. c. in mines or confined places, where oxygen levels have been depleted, ventilation may occur. d. in carbon monoxide (co) poisoning, ventilation is impaired because co binds to oxygen very quickly

c. In mines or confined places, where oxygen levels have been depleted, ventilation may occur.

Explanation:

Environments classified as “confined space” are hazardous for several reasons, but one of the main ones is the low oxygen concentration. Normally atmospheric air contains a 21% concentration of oxygen that is necessary for the maintenance of human life. Some confined spaces have this concentration of less than 21% oxygen, which can be very harmful to human life and lead to death.

Low oxygen concentration can be masked by ventilation in confined places. This is because in confined places oxygen levels may be low, but ventilation may continue despite inadequate oxygenation.

during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.