Describe the Oxygen Transportation System.

Describe the Oxygen Transportation System.

• A. Air -> Blood -> Lungs -> Heart -> Capillaries -> Muscle Cells
• B. Lungs -> Air -> Heart -> Capillaries -> Muscle Cells
• C. Air -> Lungs -> Blood -> Capillaries -> Muscle Cells
• D. Air -> Lungs -> Blood -> Heart -> Capillaries -> Muscle Cells

Answer: (D)

Oxygen moves from the air you breathe into the lungs where gas exchange happens, then into the blood, is pumped by the heart, travels through the circulatory system to the capillaries, and finally diffuses into muscle cells to fuel activity. In this sequence, air must first reach the lungs so oxygen can diffuse into the blood. The heart then acts as the pump that sends this oxygen-rich blood out to the body, delivering it through capillaries to muscle cells. The capillaries are where oxygen moves from blood into the cells that use it for energy, completing the transport path. This chain—Air → Lungs → Blood → Heart → Capillaries → Muscle Cells—accurately reflects the physiological route of oxygen from inhalation to cellular use.

Oxygen moves from the air you breathe into the lungs where gas exchange happens, then into the blood, is pumped by the heart, travels through the circulatory system to the capillaries, and finally diffuses into muscle cells to fuel activity. In this sequence, air must first reach the lungs so oxygen can diffuse into the blood. The heart then acts as the pump that sends this oxygen-rich blood out to the body, delivering it through capillaries to muscle cells. The capillaries are where oxygen moves from blood into the cells that use it for energy, completing the transport path. This chain—Air → Lungs → Blood → Heart → Capillaries → Muscle Cells—accurately reflects the physiological route of oxygen from inhalation to cellular use.