👉 The "days fluid" refers to the daily variation in the volume of the blood, which is primarily influenced by the interplay between plasma and red blood cells. Throughout the day, these components fluctuate due to factors like hydration levels, physical activity, and metabolic processes. Typically, plasma volume decreases slightly during the day, especially after waking up, as the body works to maintain homeostasis. This reduction in plasma is often accompanied by a slight increase in red blood cell concentration, leading to a higher hematocrit (the proportion of blood that is red blood cells). These daily changes ensure that the body's fluid balance and oxygen-carrying capacity are optimized for various physiological demands throughout the day.
