Download + Rh positive

Section 2:
Blood and Lymph
What are the components of blood?
What determines the type of blood
that a person can receive in a
transfusion?
What are the structures and
functions of the lymphatic system?
Blood
•Blood consists of liquid plasma and three kinds
of cells—red blood cells, white blood cells, and
platelets.
Plasma
• Plasma is the liquid part of blood that contains
water, nutrients and waste products
Blood Types
•The marker molecules on your red blood cells
determine your blood type and the type of
blood that you can safely receive in transfusions.
Blood Type Distribution
•The circle graph shows
the percentage of each
blood type found in the
U.S. population.
Rh Factor
• Rh factors are genetically determined. A baby
may have the blood type and Rh factor of
either parent, or a combination of both
parents. Rh factors follow a common pattern
of genetic inheritance.
• The Rh positive gene is dominant (stronger)
and even when paired with an Rh negative
gene, the positive gene takes over.
• If a person has the genes + +, the Rh factor in the blood
will be positive.
• If a person has the genes + -, the Rh factor will also be
positive.
• If a person has the genes - -, the Rh factor will be
negative.
• If the father's genes are + - Rh positive, and
the mother's are + - Rh positive, the baby can
be:
• + + Rh positive
• + - Rh positive
• - - Rh negative
• Problems with the Rh factor occur when the
mother's Rh factor is negative and the baby's
is positive. Sometimes, an incompatibility may
occur when the mother is blood type O and
the baby is either A or B.
The Lymphatic System
•The lymphatic system is a
network of vein-like vessels that
returns the fluid/blood to the
bloodstream.
•A drainage system for the body
•Lymph nodes filter lymph,
trapping bacteria and other
disease causing microorganisms.
•Lymph is composed of water and
dissolved minerals.