Immune system

A microbe that causes disease is a

• fungus

• pathogen

• bacteria

• illness

We have cells and tissues in our body that keep out or destroy foreign invaders

• True

• False

Organs that contain high amounts of immune cells are:

• Bone marrow, lymph nodes, throat and brain

• Lymph nodes, stomach, skin, throat and thymus

• Bone Marrow, lymph nodes, spleen, thymus and tonsils

• Spleen, stomach, stomach and skin

Microbes are viruses, bacteria, archaea, _ and parasites

What is the missing organ (1)

• lymph nodes

• bone marrow

• tonsils

• spleen

What is the missing organ (2)

• bone marrow

• spleen

• skin

• throat

What is the missing organ (3)

• Throat

• Bone marrow

• Lymph nodes

• Tonsils

What is the missing organ (4)

• Tonsils

• Skin

• Spleen

• Stomach

The outer layer of the skin is made of dead cells that block pathogens.

• True

• False

Saliva and _ are barriers to infections and contain antibodies and enzymes that destroy pathogens