A simplified model of a phagocytic cell known as a macrophage is shown above. The macrophage plays a role in innate immune function. The macrophage
engulfs small, pathogenic cells, merges them with digestive enzymes in the lysosome, and secretes the cell debris from the cell. What explanation accurately
describes why endocytosis and exocytosis are utilized by the macrophage in this process?
4.
A The macrophage lacks membrane proteins to move the cell and cell debris through the membrane.
B The pathogenic cell and cell debris are too large to pass directly through the membrane and membrane proteins.
C The pathogenic cell and cell debris must move against the gradient, using ATP and vesicles in their transport.
D
The macrophage is surrounded by a rigid cell wall, which prevents simple and facilitated diffusion of the cell and cell debris.