Final answer:
The lungs, heart, brain, and intestine require a constant supply of oxygenated blood to function well.
Step-by-step explanation:
The parts of the body that require a constant supply of oxygenated blood to function well are the lungs, heart, brain, and intestine.
The lungs are responsible for the exchange of oxygen and carbon dioxide during respiration. The heart pumps oxygenated blood to all parts of the body.
The brain requires a continuous supply of oxygenated blood to perform its functions, as it regulates and controls bodily activities. The intestine needs oxygenated blood for digestion and absorption of nutrients.
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