Summary Immune system study notes

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