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

1	The direction of gas movement is determined by
	A)	temperature.
	B)	size of the gas molecule.
	C)	solubility of the gas in blood.
	D)	partial pressure differences.
	E)	pH.
2	Which of the following statements about partial pressures of gases is TRUE?
	A)	PO2 in lung is greater than PO2 in blood ; PCO2 in lung is greater than PCO2 in blood
	B)	PO2 in lung is greater than PO2 in blood ; PCO2 in lung is less than PCO2 in blood
	C)	PO2 in lung is greater than PO2 in blood ; PCO2 in lung = PCO2 in blood
	D)	PO2 in lung is less than PO2 in blood ; PCO2 in lung is less than PCO2 in blood
	E)	PO2 in lung is less than PO2 in blood ; PCO2 in lung is greater than PCO2 in blood
3	Which of the following statements about partial pressures of gases is TRUE?
	A)	PO2 in blood is greater than PO2 in tissues ; PCO2 in blood is greater than PCO2 in tissues
	B)	PO2 in blood is greater than PO2 in tissues ; PCO2 in blood is less than PCO2 in tissues
	C)	PO2 in blood is greater than PO2 in tissues ; PCO2 in blood = PCO2 in tissues
	D)	PO2 in blood is less than PO2 in tissues ; PCO2 in blood is less than PCO2 in tissues
	E)	PO2 in blood is less than PO2 in tissues ; PCO2 in blood is greater than PCO2 in tissues
4	Oxygen-rich blood is carried through pulmonary arteries from the lungs to the heart.
	A)	True
	B)	False
5	Oxygen-poor blood is carried through systemic veins from the body tissues back to the heart.
	A)	True
	B)	False