LESSON TITLE: Putting It All Together
CURRICULUM AREA: Science
GRADE LEVEL: 6-8
OBJECTIVES: 4.05 Observe and describe how muscles cause the body to move.
ESSENTIAL QUESTION: How do muscles move bones?
Content Blast: Bones cannot move by themselves. They need muscles in order to move. Muscles called skeletal muscles are attached to a bone and allow movement. These muscles pull bones to move them. A strong band of tissue called a tendon connects a muscle to a bone.
Materials: Per Student Pair:
two bendable straws
one rubber band
two paper clips
Process Skills: Observe, Communicate, Predict, Infer
Engage: Have students put one hand, palm up, against the underside of their desk and push upward. With their other hand, have them feel the front and back of their upper arm. Discuss with students what they think is happening. This will give you their prior knowledge about muscles. Like dribbling or shooting a basketball, you need to move your arm. Have a student volunteer demonstrate a jump shot. Have other students tell how the volunteer is moving his or her arm.
Explore: Discuss with students the parts of the arm that are causing it to move. Tell them that the bones cannot move alone, they need a muscle and joints (elbow) to help them. Tell students that they will be creating a model of the bicep muscle in the arm to help them better understand how that muscle helps them move their arm. Pass out materials to each student group. Procedure:
First, students will cut the bendable part off of one straw.
They will then insert the cut straw into the bendable end of the other straw. The point where the straw bends represents the hinge joint in the arm.
Students should then poke one paper clip into Point A of the straw structure as shown in the figures below. (If students have difficulty poking the paper clips through the straws, a pushpin may be used to poke a hole first.)