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Unformatted text preview: Thymus 4. (a) Memory cells: Retain an antigen memory. They
can rapidly differentiate into antibody-producing
plasma cells if they encounter the same antigen
(b) Plasma cells: Secrete antibodies against
antigens (very rapid rate of antibody production).
(c) Helper T cells: Activate cytotoxic T cells and
other helper T cells. Also needed for B cell
(d) Suppressor T cells: Regulate the immune
system response by turning it off when antigens
(e) Delayed hypersensitivity T cells: Cause
inflammation in allergic responses and are
responsible for rejection of transplanted tissue.
(f) Cytotoxic T cells: Destroy target cells on contact
(by binding and lysing cells). 5. Immunological memory: The result of the
differentiation of B cells after the first exposure to
an antigen. Those B cells that differentiate into long
lived memory cells are present to react quickly and
vigorously in the event of a second infection. Biozone International 2009 Photocopying Prohibited Acquired Immunity (page 143)
1. (a) Active immunity describes the immunity that
develops after the body has been exposed to a
microbe or its toxins and an immune response
has been invoked.
(b) Naturally acquired active immunity arises as
a result of exposure to an antigen such as a
pathogen, e.g. natural immunity to chickenpox.
Artificially acquired active immunity arises as a
result of vaccination, e.g. any childhood disease
for which vaccinations are given: diphtheria,
measles, mumps, polio etc. 2. (a) Passive immunity describes the immunity that
develops after antibodies are transferred from one
person to another. In this case, the recipient does
not make the antibodies themselves.
(b) Naturally acquired passive immunity arises as
a result of antibodies passing from the mother
to the fetus/infant via the placenta/breast milk.
Artificially acquired passive immunity arises as Anatomy and Physiology The Lymphatic System (page 137) 24
a result of injection with immune serums e.g. in
3. Anatomy and Physiology 3. (a) Newborns need to be supplied w...
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This document was uploaded on 01/28/2014.
- Winter '13