2. 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?

3. Blood
Blood consists of liquid plasma and three kinds of cells—red blood cells, white blood cells, and platelets.

4. Plasma
Plasma is the liquid part of blood that contains water, nutrients and waste products

5. 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.

6. Blood Type Distribution
The circle graph shows the percentage of each blood type found in the U.S. population.

7. 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.

8. 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.

9. If the father's genes are + - Rh positive, and the mother's are + - Rh positive, the baby can be:
- - Rh negative

10. 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.

11. 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.