What is the typical water content of tissues?

• A. 0-10% water
• B. 10-30% water
• C. 60-90% water
• D. 30-60% water

Answer: (C)

Water content is a major component of tissue structure. In living tissues, most mass is water coming from the cytoplasm inside cells and the interstitial and extracellular fluids surrounding them. Because of this, many tissues are about three-quarters water, placing the typical tissue water content in a broad range around 60–90%. This high water content underpins diffusion, nutrient transport, and biochemical reactions that keep tissues functioning. While adipose tissue is an exception with much lower water content (around 10–20%), the common, representative value for most tissues falls in the 60–90% range. That’s why the answer reflects the broad average for tissue water content.