SB5: The Immune System

All cells and virus particles have molecules on their outer surface called ________

What is the name of white blood cells that have molecules on their surface to fit an antigen?

• memory cells

• lymphocytes

• red blood cells

• fighter white blood cells

Lymphocytes have what on their surface?

• antigens

• antibodies

• memory cells

When a lymphocyte with an antibody that perfectly fits the antigen is activated, what happens next?

• the lymphocyte divides

• lymphocytes engulf the pathogen

• lymphocytes secrete large amounts of antibodies

Lymphocytes that remain in the blood are known as ______ lymphocytes

If the same kind of pathogen tries to infect you again, the memory lymphocytes cause a much faster _____________

• primary response

• secondary rsponse

• tertiary response

The secondary response is slower than the primary response, true or false?

• true

• false

A _______ is something that contains antigens of a pathogen that can trigger an immune response without you having the disease

Immunisation in the UK has caused diseases such as measles to become very rare, true or false?

• true

• false

What is herd immunity?

• When every single person gets vaccinated

• When the disease doesn't exist anymore

• When a high percentage of the population is vaccinated