The head and brain receive their supply of oxygenated blood from the:

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Study for the Nassau County EMT Test. Prepare with flashcards and multiple-choice questions. Each question is accompanied by hints and explanations. Get ready for your exam!

Multiple Choice

The head and brain receive their supply of oxygenated blood from the:

Explanation:
The carotid arteries are the main suppliers of oxygen-rich blood to the head and brain. The internal carotids deliver blood directly to the brain, feeding areas through the circle of Willis and supplying the cerebral cortex, while the external carotids supply the face and scalp. The vertebral arteries, which come from the subclavian arteries, also reach the brain but are part of the posterior circulation rather than the primary source. Renal arteries go to the kidneys, and pulmonary arteries carry blood to the lungs (and carry deoxygenated blood), not to the brain.

The carotid arteries are the main suppliers of oxygen-rich blood to the head and brain. The internal carotids deliver blood directly to the brain, feeding areas through the circle of Willis and supplying the cerebral cortex, while the external carotids supply the face and scalp. The vertebral arteries, which come from the subclavian arteries, also reach the brain but are part of the posterior circulation rather than the primary source. Renal arteries go to the kidneys, and pulmonary arteries carry blood to the lungs (and carry deoxygenated blood), not to the brain.

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