1. Blood
Chapter 9
Section 1

2. 1. Functions of Blood
carries oxygen from lungs to body cells and carries carbon dioxide from body cells to lungs to be exhaled
carries waste products from cells to kidneys
transports nutrients and other substances to body cells
cells and molecules in blood fight infections and help heal wounds

3. 2. Blood
tissue made of plasma, red and white blood cells, and platelets
makes up 8% of body’s total mass

4. Parts of Blood
Plasma – liquid part of blood made up mostly of water. Nutrients, minerals, and oxygen are dissolved here. Wastes are carried away in the plasma
White blood cells – cells that destroy bacteria, viruses, and foreign substances;

5. Parts of Blood
Red blood cells – they contain hemoglobin. Oxygen and carbon dioxide attaches to the hemoglobin, and is carried throughout the body.
Platelets – help stop bleeding by clotting

6. 7. Steps in Blood Clotting
1. Platelets and clotting factors in your blood make a blood clot that plugs the wounded blood vessels
2. Platelets stick to the wound and fibrin creates a threadlike, sticky net to trap blood cells and plasma to form a clot
3. The clot hardens to form a scab

7. 7. Steps in Blood Clotting…continued
4. Under the scab, skin cells begin repairing underneath 5. Bacteria that get under the wound during healing are usually destroyed by white blood cells

8. 8. Hemophilia
genetic condition where a person lacks a clotting factor that begins the clotting process
person could bleed to death from a minor wound

9. 8. Why is knowing your blood type important?
In case of a blood transfusion, the Dr. needs to the right type of blood to be given, or the blood cells will clump together
Clots then form in the blood vessels and the person could die, because antibodies try to destroy the foreign antigen

10. 9.Blood Types People inherit 4 types of blood - A,B, AB, O
A, B, and AB have antigens on their red blood cells
O red blood cells have no antigens

11. 10. Rh Factor People inherit 2 types of Rh factors – Rh+, Rh-
If the Rh factor is present, then the blood is Rh+, if it is absent, then it’s Rh-
If an Rh- mother is pregnant, then she can make antibodies against her Rh+ baby during pregnancy

12. 11. Anemia (a blood disease)
body tissues cannot get enough oxygen and are unable to carry on their usual activities
Caused by loss of blood, lack of iron, or are inherited by the shape of red blood cells (sickle-cell anemia)

13. 12. Leukemia (another blood disease)
One type of white blood cells are made in excess and cannot fight infections, these crowd out healthy cells
low red blood cell count, normal white blood cell and platelet count
Can affect children, but more common in adults
Treated by medicine, blood transfusions, and bone marrow transplants