What is the physiologic effect when the oxygen level is 15-19%?

What is the physiologic effect when the oxygen level is 15-19%?

• A. Dizziness
• B. Respiratory rate increases
• C. Unconsciousness
• D. Coma

Answer: (B)

When inspired oxygen falls to 15–19%, the body responds by driving the breathing rate higher. Peripheral chemoreceptors detect the lower arterial oxygen tension and signal the brainstem to increase ventilatory drive, so breathing becomes faster (and deeper) to boost oxygen intake and CO2 removal. This early compensatory action helps maintain tissue oxygen delivery despite the reduced oxygen level. Dizziness, unconsciousness, or coma are associated with more severe hypoxemia or longer exposure, not the immediate response at this level. So the key effect here is an increased respiratory rate as the body tries to compensate for lower oxygen availability.

When inspired oxygen falls to 15–19%, the body responds by driving the breathing rate higher. Peripheral chemoreceptors detect the lower arterial oxygen tension and signal the brainstem to increase ventilatory drive, so breathing becomes faster (and deeper) to boost oxygen intake and CO2 removal. This early compensatory action helps maintain tissue oxygen delivery despite the reduced oxygen level. Dizziness, unconsciousness, or coma are associated with more severe hypoxemia or longer exposure, not the immediate response at this level. So the key effect here is an increased respiratory rate as the body tries to compensate for lower oxygen availability.