Which structure is essential for providing nutrients to the tissues of the body through the blood?

The structure that is essential for providing nutrients to the tissues of the body through the blood is plasma. Plasma is the liquid component of blood, making up about 55% of its overall content. It serves as a transportation medium for various substances, including nutrients, hormones, and waste products. Plasma carries important nutrients such as glucose, amino acids, vitamins, and minerals, which are essential for the body's cellular functions and overall homeostasis.

In addition to transporting nutrients, plasma also plays a crucial role in maintaining blood pressure and regulating body temperature. It contains proteins like albumin, which help in the oncotic pressure that supports fluid balance in tissues.

Red blood cells, on the other hand, are primarily responsible for the transport of oxygen from the lungs to tissues and facilitating carbon dioxide removal from tissues back to the lungs. While they are vital for cellular respiration, they do not directly transport nutrients.

Platelets are involved in the clotting process, which is essential for stopping bleeding, but they do not play a role in nutrient distribution. White blood cells are part of the immune system, focusing on defending the body against infections rather than nutrient transport. Therefore, plasma is the critical component for nutrient delivery within the circulatory system.