Final answer:
Hypoxemia is a condition characterized by low levels of oxygen in systemic arterial blood. Mild hypoxemia is indicated by a PaO2 value of 75. It can be caused by various factors and may lead to symptoms like fatigue and shortness of breath.
Step-by-step explanation:
Hypoxemia refers to low levels of oxygen in systemic arterial blood. In the given context, mild hypoxemia is indicated by a PaO2 value of 75, which is lower than the normal range. Hypoxemia can be caused by various factors such as decreased oxygen supply or impaired lung function. The condition can lead to symptoms like fatigue, confusion, and shortness of breath.