1. Lesson 13
What is blood made of?

2. In first-aid, you learn how to help people who are hurt
In first-aid, you learn how to help people who are hurt. An important first-aid rule is:
Treat serious bleeding first.
A person can die very quickly from a loss of blood.

3. Blood is the main tissue of transport in your body.
It carries needed materials to the cells.
It carries waste materials away from the cells.
It has a liquid part and a solid part.

4. Plasma is the liquid part of blood.
-It is 90% water, and is straw colored.
-Digested food, important chemicals, and waste products are dissolved in plasma.

5. Blood Cells are solid matter carried in the blood
Blood Cells are solid matter carried in the blood. There are three kinds of blood cells.

6. Red Blood Cells:
-contains hemoglobin, which gives blood its red color
-hemoglobin carries oxygen to the cells
-hemoglobin picks up most of the carbon dioxide from the cells and takes it to the lungs.

7. White Blood Cells:
-fight disease and infection
-destroy harmful germs in the body

8. Platelets
-tiny, colorless pieces of cells
-help stop bleeding
-give off a chemical that helps blood clot

10. Blood has been called “The River of Life” because:
-it carries to the cells materials that are needed by the cells
-it carries away from the cells waste materials made by the cells

11. Place the items below where they belong in the chart.
Carbon dioxide
oxygen
Extra salt
Dissolved food
Extra water
Excess heat
vitamins
Taken away from cells
Brought to cells