What substance is described as the yellow fluid that transports blood cells and nutrients?

The yellow fluid that transports blood cells and nutrients is known as plasma. Plasma is a key component of blood, making up about 55% of its overall volume. It consists primarily of water, but also contains important substances such as electrolytes, proteins, hormones, waste products, and nutrients. These nutrients include glucose, fatty acids, and vitamins, which are vital for the body's metabolic processes.

Plasma also plays a crucial role in maintaining blood pressure and regulating body temperature. As blood flows through the circulatory system, plasma ensures that the various cells, including red blood cells, white blood cells, and platelets, are suspended and can move freely. The unique properties of plasma, including its ability to dissolve a wide range of substances, make it essential for transporting molecules throughout the body.

Other choices may describe bodily fluids but do not accurately refer to the substance directly responsible for this transportation role. Sera and serum, while related to components of blood, have specific contexts in medical biology and are often derived from plasma without clotting factors. Lymph, on the other hand, pertains to a fluid involved in the lymphatic system and is not directly responsible for transporting blood cells and nutrients within the bloodstream.