THE IMMUNE SYSTEM
	•——third line of defence——>	adaptive immunity
		•——comprises——>	cell mediated immunity
		•——comprises——>	humoral immunity
	•——if altered, leads to ——>	immune disorders
	•——acts through——>	cells
	•——second line of defence——>	innate immunity
	•——formed by——>	organs
	•——first line of defence——>	physical barriers
	•——reacts to——>	vaccination