Arterial hypoxemia and tissue hypoxia are not two names for the same condition, but two different conditions and there is a relationship between them.

Breath holding is the act of temporarily stopping breathing on purpose, such as when diving, suffocating from smoke, going to a toxic gas area... A normal, healthy person can hold their breath for 3-5 minutes on average. However, a person's ability to hold their breath can increase if they practice regularly, are a diver or a professional athlete.