The body has adapted defence mechanisms to protect itself against the entry of microorganisms.
What is the role of the phagocytes in the immune system?
To eat harmful microorganisms.
To engulf and digest harmful microorganisms.
To release antibodies against harmful microorganisms.
What are antibodies?
Chemicals, released by lymphocytes that attach to specific antigens.
Lymphocytes that attach to specific antigens.
Microorganisms that attack the host's immune system.
Vaccination results in the manufacture of memory cells. What do these do?
They enable future antibody production to be slower but in greater quantities.
They enable future antibody production to be faster but in lower quantities.
They enable future antibody production to be faster and in greater quantities.
Which statement best describes the purpose of blood clotting at a wound?
To stop the loss of blood.
To stop the loss of blood and prevent the entry of microorganisms into the body.
To use up excess platelets in the blood.
How do antibiotics work?
They can stop bacteria from growing or reproducing.
They can stop viruses from growing or reproducing.
They can stop toxins poisoning the tissues of the host.
Why is it important to use antibiotics carefully?
Antibiotics are expensive.
To reduce the formation of resistant strains of bacteria.
Antibiotics could kill harmless viruses.
What do antibodies do to microorganisms?
Engulf and digest them.
Clump them together.
Which immune response is fastest?
In which type of immunity does the immune system make antibodies?
Both passive and active.