Date: 2-13-02

Subject: Science

Grade: 5^th

Time needed: 45 minutes

1. Objectives:

Students will:

1. Continue investigating the components of human blood.

• "Windows on Science" videodisk and television
• 2 1/2 cups of light corn syrup
• 2 cups of Red Hots
• 10 white jellybeans
• 1/2 teaspoon of candy sprinkles
• clear large bowl
• small cups
• graded student worksheets from previous lesson

Introduction:

Have students take out a sheet of lined paper. Give the class 5 minutes to write what they have learned about blood. Explain to them that they are to write at least four things.

Motivation:

1. After students have had the opportunity to write what they have learned about blood, collect their papers.
2. Explain that today they are going to make blood.
3. Review with the students the components of blood. Have students raise their hands and suggest the components aloud.

Content to be covered:

During this activity students will review the components of blood and mix up a batch of candy "blood".

Student Activities:

1. Begin by playing the short clip of a person drawing blood, followed by the clip of blood separating from the videodisk.
2. Have the students notice the layers shown on the screen.
3. Hold a class discussion on the 4 components of blood.
4. The students can use their Blood Web Hunt handout as a reference.
5. Begin the class discussion with red blood cells and use the videodisk as a tool to view the shape and size.
6. Chose a students to add the Red Hots to the glass bowl.
7. Next, discuss white blood cells and use the videodisk as a visual reference.
8. Add the white jelly beans to the bowl.
9. Discuss platelets and use the videodisk as a visual reference.
10. Add the candy sprinkles to the bowl.
11. Discuss plasma and use the videodisk as a visual reference.
12. Add the corn syrup to the bowl.
13. Mix the contents of the bowl and have students notice the overall color of the mixture.  Discuss the amounts of each ingredient in the blood bowl and how that compares to the amount of the different types of cells in real human blood.
14. Spoon the mix into small cups. 

Independent Practice:

As students receive their cups, have each share with the class one thing they learned while creating the candy blood.

If time allows, read some of the students' responses from the introduction activity aloud to the class.

Class discussions can be difficult if students do not participate. If this happens, use name sticks to call on students to participate in the class discussion.

By having students share one thing they learned while passing out the cups, it was evident that the students continued to investigate the components of human blood during this lesson. They also showed great interest in the short video clips from the videodisk.

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