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Unformatted text preview: MHC antigens
(proteins) that are attached to the surfaces of all
body cells and are used by the immune system
to distinguish its own tissue from that which is
Biozone International 2009 Photocopying Prohibited A anti-B A, AB A, 0 B anti-A B, AB B, O AB A+B none AB A, B, AB, O O None anti-A +
anti-B O, AB,
A, B O 2. (a) Blood typing could eliminate who the murderer
could not be (i.e. exclude some blood types).
(b) It is very unlikely that blood typing could establish
definitively who the murderer was.
(c) A DNA profile.
(d) Blood typing is not used forensically because
there are too many people who share a common
blood type. The pool of “suspects” would be too
large. 3. Discovery of the basis of the ABO system allowed the
possibility of safe transfusions and greatly improved
survival and recovery after surgery or trauma. The Body’s Defenses (page 131)
1. The first line of defense provides non-specific
resistance by forming a physical barrier to the entry
of pathogens. Chemical secretions from the skin,
tears, and saliva also provide antimicrobial activity
and help destroy pathogens and wash them away.
The second line of defense provides non-specific
resistance operating inside the body to inhibit or
destroy pathogens (irrespective of what type of
pathogen is involved). Whereas the third line of
defense provides specific defense resistance against
particular pathogens once they have been identified
by the immune system (antibody production and cellmediated immunity). 2. Specific resistance refers to defense against
particular (identified) pathogens. It involves a range
of specific responses to the pathogen concerned
(antibody production and cell-mediated immunity). In The natural population of (normally non-pathogenic)
microbes can benefit the host by preventing
overgrowth of pathogens (through competitive
exclusion). 2. Can receive
blood from: B Targets for Defense (page 129)
blood to: A Endurance athletes have a smaller body weight. 5. Completed table: Bloo...
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This document was uploaded on 01/28/2014.
- Winter '13