Question

lo 3.6. the human body has a complex network of ____ that pump oxygen - rich blood from the heart to all parts of the body.
bronchioles
alveoli
veins
arteries
capillaries

Explanation:

• Bronchioles: Part of the respiratory system, not involved in blood circulation.
• Alveoli: Gas - exchange units in the lungs (respiratory system), not for blood transport.
• Veins: Carry deoxygenated blood back to the heart (except pulmonary veins which carry oxygenated blood from lungs to heart, but the general function described in the question is more characteristic of arteries).
• Arteries: By definition, arteries (systemic arteries) carry oxygen - rich blood away from the heart to all parts of the body.
• Capillaries: Microscopic blood vessels for nutrient and gas exchange between blood and tissues, not the main vessels for pumping blood from the heart.

Answer:

Arteries