View the animation below, then complete the quiz to test your knowledge of the concept.

1	Red blood cells are also called
	A)	hemoglobin.
	B)	monocytes.
	C)	white blood cells.
	D)	erythrocytes.
2	Red blood cells in an isotonic solution are
	A)	lozenge shaped.
	B)	shriveled.
	C)	empty membraned.
	D)	cube shaped.
3	Red blood cells put in a hypertonic solution will
	A)	not be affected in any way.
	B)	form linear edges.
	C)	shrivel and become crenated.
	D)	be destroyed by hemolysis.
4	Red blood cells put in a hypotonic solution will
	A)	not be affected in any way.
	B)	form linear edges.
	C)	shrivel and become crenated.
	D)	be destroyed by hemolysis.
5	Human erythrocytes function best in a
	A)	hypertonic solution.
	B)	isotonic solution.
	C)	hypotonic solution.
	D)	bacterial solution.