College of Massage Therapists of British Columbia (CMTBC) Practice Exam

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What leads to the oxygenation of blood in the lungs?

  1. Blood flows from the left ventricle to the body

  2. Blood is drawn into the heart from the aorta

  3. Pulmonary arteries deliver deoxygenated blood to the lungs

  4. Blood leaves the heart through veins after being oxygenated

The correct answer is: Pulmonary arteries deliver deoxygenated blood to the lungs

The correct option highlights the role of pulmonary arteries in the process of oxygenation. These arteries carry deoxygenated blood from the right side of the heart to the lungs. Once the blood reaches the lungs, it passes through the capillaries surrounding the alveoli, where carbon dioxide is exchanged for oxygen. This exchange is crucial for replenishing oxygen levels in the blood, allowing it to become oxygenated before returning to the heart. The other options illustrate different aspects of the circulatory system but do not pertain directly to the oxygenation process in the lungs. For instance, the flow of blood from the left ventricle to the body occurs after blood has been oxygenated in the lungs and is no longer relevant to the immediate process of oxygenation. Similarly, while blood is drawn into the heart from the aorta, this occurs after the blood has already been oxygenated and is being distributed to the body's tissues. Lastly, blood leaving the heart through veins after being oxygenated also does not connect directly to the mechanism of oxygenation occurring in the lungs. The critical action of oxygenation primarily takes place when deoxygenated blood is transported to the lungs by the pulmonary arteries.

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