11 Questions
Which of the following is true about the respiratory quotient?
It is the ratio of the amount of carbon dioxide produced by the body to the amount of oxygen consumed.
Where does oxygen diffuse from the blood to the tissues?
From the alveoli to the blood
How does gas exchange occur in the lungs?
By diffusion down partial pressure gradients
Which gas is approximately 20 times more soluble than oxygen in water?
Carbon dioxide
How is oxygen primarily transported in the blood?
Bound to hemoglobin
What is the main form in which carbon dioxide is transported between tissues and lungs?
As bicarbonate ions
What is the primary stimulus to the central chemoreceptors in detecting changes in arterial blood?
PCO2
Under steady-state conditions, the rate at which oxygen enters pulmonary capillaries from alveolar air is equal to
The rate at which oxygen is delivered to alveoli in inspired air.
Under normal resting conditions in systemic arteries, hemoglobin is
Approximately 98% saturated.
The effect that pH has on the hemoglobin-oxygen dissociation curve is referred to as
The Bohr effect.
Which of the following does not affect alveolar PO2?
The volume of air contained in the alveoli.
Test your knowledge on the gas exchange process in the respiratory system and how breathing is regulated. Explore the movement of oxygen and carbon dioxide in the alveolar air and blood.
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