Immune System
Body’s defence against infectious organisms + other invaders
Series of Steps = The immune response
Attacks organisms + substances that invade body systems and
cause disease
Made up of special cells : Cells defends people against microbes
Tissues
Organs
Important cell involved:
White blood cell = Leukocytes
Come in 2 Basic types that combine to seek out + destroy disease causing
organisms / substances.
Produced or Stored in many locations - Thymus, Spleen, Bone Marrow
called Lymphoid organs
Lymph Nodes also hold leukocytes
Circulate through body between organs + lymph nodes
via lymphatic vessels & blood vessels
I.S works in coordinated manner to monitor body
, Good Guys
Lymph Clear fluid that travels through lymphatic system + carries cells to fight
infections & other diseases
Lymph Nodes Rounded masses of lymphatic tissue that’s surrounded by capsule of
connective tissue
Filter lymph + store white blood cells
Located along lymphatic vessels
Lymph Vessels Thin tubes that carry lymph + white blood cells thru lymphatic system
Branch (like blood vessels) into all tissues of body
Thymus & Spleen Organs involved in making lymphocytes
White Blood Cells Cells made my bone marrow, thymus & spleen
Help body fight infections
Types of Blood Cells
Red Blood Cells Helps in O2 and CO2 exchange
(Erythrocytes)
Platelets Help in blood clotting
(Thrombocytes)
White Blood Cells Neutrophil: Phagocytic cell Eosinophil: Releases toxins that
(Leukocytes) 1st responders to kill microbes
site of infection
Basophil: Defence against Lymphocytes: see on next pg.
parasites
Monocyte: develops in2 macrophages = phagocytic cells that
engulf & destroy microbes
Body’s defence against infectious organisms + other invaders
Series of Steps = The immune response
Attacks organisms + substances that invade body systems and
cause disease
Made up of special cells : Cells defends people against microbes
Tissues
Organs
Important cell involved:
White blood cell = Leukocytes
Come in 2 Basic types that combine to seek out + destroy disease causing
organisms / substances.
Produced or Stored in many locations - Thymus, Spleen, Bone Marrow
called Lymphoid organs
Lymph Nodes also hold leukocytes
Circulate through body between organs + lymph nodes
via lymphatic vessels & blood vessels
I.S works in coordinated manner to monitor body
, Good Guys
Lymph Clear fluid that travels through lymphatic system + carries cells to fight
infections & other diseases
Lymph Nodes Rounded masses of lymphatic tissue that’s surrounded by capsule of
connective tissue
Filter lymph + store white blood cells
Located along lymphatic vessels
Lymph Vessels Thin tubes that carry lymph + white blood cells thru lymphatic system
Branch (like blood vessels) into all tissues of body
Thymus & Spleen Organs involved in making lymphocytes
White Blood Cells Cells made my bone marrow, thymus & spleen
Help body fight infections
Types of Blood Cells
Red Blood Cells Helps in O2 and CO2 exchange
(Erythrocytes)
Platelets Help in blood clotting
(Thrombocytes)
White Blood Cells Neutrophil: Phagocytic cell Eosinophil: Releases toxins that
(Leukocytes) 1st responders to kill microbes
site of infection
Basophil: Defence against Lymphocytes: see on next pg.
parasites
Monocyte: develops in2 macrophages = phagocytic cells that
engulf & destroy microbes
