A Level Biology Practice Exam

What is tissue fluid?

1. the vacuum formed in the tissues of organisms

2. the liquid found inside all cells

3. the solution surrounding cells of multicellular animals

4. the inflammatory fluid that forms due to injury

The correct answer is: the solution surrounding cells of multicellular animals

Tissue fluid is best defined as the solution that surrounds the cells of multicellular animals. This fluid is critical for maintaining the exchange of nutrients, gases, and waste products between the blood and cells. It originates from blood plasma, as it filters through the capillary walls and nourishes tissues by providing essential substances while also helping to remove metabolic waste. This environment is crucial for cellular function, allowing for diffusion processes that enable cells to receive what they need and dispose of unwanted material. The definition emphasizes the role of tissue fluid in facilitating cellular processes and homeostasis, highlighting its importance in the body’s overall functioning. It is not to be confused with other types of fluids mentioned in the options, as each of those represents different physiological contexts that do not accurately describe tissue fluid’s unique role.