choose the correct statement concerning blood vessels.
a. venules control blood flow through capillaries.
b. arterioles drain blood from capillaries.
c. veins have thinner walls, but more valves than arteries.
d. nutrient exchange may occur along arterial vessels.
e. all of the choices are correct.
thank you!
To choose the correct statement concerning blood vessels, let's analyze each option:
a. Venules control blood flow through capillaries: This statement is incorrect. Venules are small blood vessels that collect blood from capillaries and merge to form veins, but they do not directly control blood flow through capillaries.
b. Arterioles drain blood from capillaries: This statement is incorrect. Arterioles are small blood vessels that branch out from arteries and lead to capillaries. They supply blood to capillary beds rather than draining blood from capillaries.
c. Veins have thinner walls, but more valves than arteries: This statement is correct. Veins generally have thinner walls compared to arteries, allowing them to expand and accommodate more blood. Veins also have valves that prevent backflow of blood, which helps facilitate the return of blood to the heart.
d. Nutrient exchange may occur along arterial vessels: This statement is incorrect. Nutrient exchange primarily occurs in capillaries, as they have thin walls that allow for the exchange of oxygen, nutrients, and waste products between blood and surrounding tissues.
Considering our analysis, the correct statement is option c: Veins have thinner walls, but more valves than arteries. Therefore, the answer is not e (all of the choices are correct).