👉 The "including fluid" refers to the liquid that surrounds and supports cells within an organism, playing a crucial role in their function and survival. This fluid, often called interstitial fluid, fills the spaces between cells (interstitial spaces) and the walls of blood vessels (capillaries). It facilitates the exchange of nutrients, oxygen, and waste products between cells and the bloodstream. Additionally, it helps maintain cellular homeostasis by regulating temperature and pH levels, ensuring that cells operate in an optimal environment. This fluid is essential for the transport of substances and the overall physiological processes within multicellular organisms.
