👉 The entry fluid, also known as the intravascular fluid, refers to the liquid that circulates within the blood vessels of the body. This fluid is essential for maintaining blood volume, pressure, and overall circulatory function. It consists mainly of water, proteins, electrolytes, and various nutrients, and it plays a crucial role in transporting oxygen, nutrients, hormones, and waste products between cells and tissues. The entry fluid is dynamic, constantly being exchanged between the blood and interstitial spaces, and its composition can change based on physiological needs, such as during exercise or stress.