A) Capillaries are the principle sites in closed circulatory systems where blood releases oxygen,nutrient molecules,and hormones.
B) Oxygen must diffuse across 2-10 layers of epithelial cells to exit capillaries and reach its target cells.
C) Capillaries are more numerous than arterioles but less numerous than venules.
D) The lumen of capillaries is large enough for 2-10 red blood cells to flow adjacent to one another.
E) Capillaries are only found near specialized brain and lung cells.

A) exposure to radiation.
B) red blood cell deposits.
C) the removal of cholesterol.
D) an increase in muscle cells.
E) fatty deposits.

A) one complete;two complete
B) two complete;two partial
C) one partial;two complete
D) two complete;four complete
E) four complete;one partial