LESSON TITLE: Hard Bones
CURRICULUM AREA: Science
GRADE LEVEL: 6-8
OBJECTIVE: 4.02 Describe several functions of bones:
ESSENTIAL QUESTION: What makes your bones strong?
Time: one 30-minute period
Content Blast: Most children think of bones as hard, dry, white parts of the body. The bones are hard, but they are definitely not dry. Bones are alive and are made of a mix of hard materials and living cells. The hard part of the bone is made mostly of calcium and phosphorous. These minerals give bones their strength. Inside bones is a soft tissue known as marrow. Cartilage is a flexible tissue that covers the ends of some bones. It helps to protect bones from grinding against one another. The inside of a bone do not add strength to the bone, but it does make new blood cells and produces germ-fighting white blood cells.
Materials: Per Student Group:
two toilet paper rolls
overhead, poster, or diagram of inside of a bone ( look in the reference
section of your science book)
Process Skills: Observe, Communicate, Predict, Classify, Infer
Engage: Ask the students how strong they think bones are. Pose questions such as “Are bones stronger than your pencil, stronger than a ruler, stronger than a piece of chalk, stronger than a piece of wood, etc.” These questions will give students a base to form their own comparisons.
Explore: This activity will give students an idea of bone strength. Using a toilet paper roll, place the roll on the table so that it stands on its end. Tell students the toilet paper roll represents the bone. Tell students we are going to place a book on top of the roll. Have students predict what will happen to the roll when a book is placed on top of it. Will the roll be able to hold it or will the roll be bent or broken? Place the book on top of the roll. It should easily support the book.
Explain: Tell students that bones are not solid, but are hollow like the toilet