Weegy: Arteries use elasticity to push blood further along the bloodstream. User: The alveoli are small sacs within the lungs that act as filters.
False Weegy: That is true User: Exercise has no effect on breathing.
False User: The thin, narrow structure of the capillaries is well-suited to their function because the capillaries _____.
only carry the liquid portion of blood
transport substances directly to the body ... (More)