What substance nourishes and supplies oxygen to the body?

• A. Oxygen
• B. Blood
• C. Nerve fluid
• D. Lymph

Answer: (B)

Blood is the substance that nourishes and supplies oxygen to the body. It plays a crucial role in the circulatory system, transporting oxygen from the lungs to various tissues and organs. Additionally, blood carries essential nutrients, hormones, and waste products, facilitating the overall nourishment and metabolic functions of the body.

Throughout the body, blood cells, primarily red blood cells, are responsible for capturing oxygen during respiration and delivering it to cells, which is essential for cellular functions and energy production. Furthermore, blood also helps in maintaining body temperature, pH levels, and fluid balance, making it indispensable for overall health.

While oxygen is vital for life, it is the combination of blood's transport functions and nutrient delivery that underscores its role in nourishing the body. Other options like nerve fluid and lymph have specific functions in the nervous and immune systems, respectively, but they do not play a direct role in the nourishment and oxygenation process as blood does.