Question

question 2
the exchange of oxygen, nutrients, and waste materials in the tissues takes place across the walls of small vessels called ____.
arterioles
lymphatics
capillaries
venules
microvessels
ducts

Explanation:

Capillaries are the smallest blood vessels with thin walls that allow for the exchange of oxygen, nutrients, and waste materials between the blood and the tissues. Arterioles carry blood away from the heart to capillaries, lymphatics are part of the lymph - system, venules collect blood from capillaries to veins, microvessels is a general term and ducts are not involved in this type of exchange in the context of blood - tissue interaction.

Answer:

C. capillaries