Question

cells need oxygen to make energy. oxygen - rich blood is transported to tissues. when the oxygen is dropped off needs to move through structures that are small and thin.
which vessels allow for oxygen movement into the tissues?
○ arteries
○ veins
○ heart
○ capillanes

Explanation:

Capillaries are the smallest blood vessels with thin walls. This structure allows for easy diffusion of oxygen (and other substances like nutrients and waste) between the blood and the surrounding tissues. Arteries carry oxygen - rich blood away from the heart but have thicker walls not designed for easy oxygen transfer. Veins carry blood back to the heart. The heart is a muscular organ that pumps blood, not a vessel for oxygen - tissue transfer.

Answer:

capillaries