Question

select the correct answer from the choices provided in the underlined sections. arterioles / venules directly connect to capillaries and are essential for slowing / increasing blood flow. arterioles / venules connect capillaries to veins.

Explanation:

1. Arterioles are small arteries that connect to capillaries. Their function includes regulating blood flow by constricting or dilating, which is key for slowing blood flow as blood moves from arteries (higher pressure) to capillaries (where exchange occurs). Venules are small veins that connect capillaries to veins.
2. For the first blank: Arterioles connect to capillaries (Venules connect capillaries to veins, not directly to capillaries as a starting point for capillary connection from arteries).
3. For the second blank: Arterioles help slow blood flow (since blood moves from high - pressure arteries to capillaries, arterioles' constriction/dilation controls the rate, and slowing is needed for capillary exchange).
4. For the third blank: Venules are the vessels that connect capillaries to veins (Arterioles connect to capillaries from arteries).

Answer:

First blank: Arterioles; Second blank: slowing; Third blank: Venules