Antarctic bottom water is the coldest water on Earth.
While the question is somewhat ambiguous as it doesn't specify a particular body of water, the provided text highlights Antarctic bottom water as the coldest, saltiest water globally. This deep ocean water is significantly colder than any surface water, or water found in lakes or rivers. The provided text does not offer information about the temperature of water within specific organs of living beings.
The references provided mostly focus on the effects of cold water on the human body, such as cold shock response, hypothermia, and the dangers of cold water immersion. They do not directly address the temperature of water within organs. The references touch on the physiological responses to cold water temperatures, illustrating how even water only moderately colder than body temperature can trigger significant physiological reactions.
- Cold Shock Response: Entering cold water triggers a sudden gasp, rapid breathing, and changes in heart rate and blood pressure. [Source: https://www.weather.gov/safety/coldwater]
- Hypothermia: Water doesn't need to be extremely cold to induce hypothermia; any water colder than normal body temperature causes heat loss. [Source: https://www.mayoclinic.org/diseases-conditions/hypothermia/symptoms-causes/syc-20352682]
- Blood Flow Reduction: As water temperature decreases, blood flow to extremities also decreases. [Source: https://www.ncbi.nlm.nih.gov/books/NBK232852/]
Therefore, focusing on the original question's literal interpretation, the answer is unequivocally Antarctic bottom water.
