The immune system and its defence

How many lines of defence are there in our body?

• 1

• 2

• 3

• 4

Bacteria that are harmful to people and cause them to get sick are called _____.

• pathogen

• lymph nodes

• antibody

• immunity

Which of the following is the body’s first line of defense against disease?

• body immune system

• white blood cells

• antibodies

• skin

Pathogens can enter our bodies through ____________ . (You can choose more than one answer.)

• respiratory system

• digestive system

• excretory system

• skin

_____________ is the ability of the body system to resist pathogens before it is infected.

• Immunity

• Pathogen

• Antigen

• Antibody

In our body, the first line of defence consists of skin and mucous membrane.

• True

• False

Which of the following can be pathogens?

• Bacteria only

• Viruses only

• Bacteria and viruses

• Neither bacteria or viruses

Infectious diseases are caused by _________ in the body.

• pathogens

• decomposers

Which best distinguishes an infectious disease from a noninfectious disease?

• Infectious diseases can be cured with antibiotics; noninfectious diseases cannot.
• Infectious diseases can be prevented with vaccines; noninfectious diseases cannot.
• Infectious diseases can be spread from one organism to another; noninfectious diseases cannot.
• Infectious diseases cannot be transmitted from one organism to another; noninfectious diseases can.

Which pathogen is non-living?

• Virus

• Bacteria

• Fungi

• Parasite/Protist

• They are all alive