The term "fast tissue" refers to:

The term "fast tissue" specifically refers to tissues in the body that absorb and eliminate nitrogen at a quicker rate compared to other tissues, especially during pressurized environments like diving. Fast tissues, such as the brain, central nervous system, and highly vascularized organs, have a higher blood flow, which allows them to absorb nitrogen more rapidly when a diver is exposed to increased pressure underwater. Consequently, during decompression, these tissues also off-gas nitrogen more quickly as pressure decreases, making them more susceptible to conditions like decompression sickness if a diver ascends too rapidly. Understanding the behavior of fast tissues is crucial for safe diving practices and planning ascent profiles correctly to manage nitrogen absorption and elimination effectively.