Which body system is primarily responsible for oxygen transport?

• A. The skeletal system
• B. The digestive system
• C. The circulatory system
• D. The lymphatic system

Answer: (C)

The circulatory system is primarily responsible for oxygen transport in the body. This system includes the heart, blood vessels, and blood, which work together to circulate oxygenated blood from the lungs to various tissues and organs. When you inhale, oxygen enters the lungs, where it diffuses into the blood within the pulmonary capillaries. Hemoglobin in red blood cells binds to this oxygen and carries it through the vascular system to deliver it to cells throughout the body, supporting cellular respiration and energy production.

In contrast, the skeletal system provides structure and support to the body but does not transport oxygen. The digestive system is responsible for breaking down food and absorbing nutrients, while the lymphatic system plays a role in immune function and fluid balance, but it does not have a primary role in oxygen transport. Thus, the circulatory system is uniquely equipped to handle the critical task of oxygen delivery, making it the correct answer.