Worksheet 8: Class 6 Science - Body Movements

Welcome! In this worksheet, we'll explore the incredible ways our bodies and other animals move. We will learn about the human skeletal system, the types of joints, and how muscles make movement possible. Let's get moving!

The Human Body and Its Movements

The human body is built for movement. Our bones and muscles work together to help us walk, run, and jump. The **skeleton** is the framework of our body, made up of bones. It gives shape and provides support. A human skeleton has about 206 bones.

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A place where two or more bones meet is called a **joint**. Joints allow our body parts to bend and move. There are different types of joints:

• **Ball-and-Socket Joint:** This joint allows movement in all directions (like a ball fitting in a socket). Example: Shoulder joint.
• **Hinge Joint:** This joint allows movement only in one plane, like a door hinge. Example: Elbow and knee joints.
• **Pivot Joint:** This joint allows the head to turn from side to side. It is found where our head connects to our neck.
• **Fixed Joints:** These joints do not allow any movement. Example: The joints in our skull.

Muscles are attached to the bones. They work in pairs to cause movement. When one muscle contracts (shortens), the bone is pulled, and the other muscle relaxes. To move the bone back, the first muscle relaxes and the second one contracts.

Practice Questions

1. Fill in the blank: The framework of the human body is called the _____.

Skeleton

2. True or False: Bones can bend without the help of joints.

False. Bones cannot bend on their own. They need joints to allow movement.

3. Match the joint to its location:

(a) Elbow joint (i) Ball-and-Socket Joint

(b) Shoulder joint (ii) Hinge Joint

(c) Neck joint (iii) Pivot Joint

a - ii, b - i, c - iii

4. Explain how muscles work in pairs to cause movement.

When one muscle contracts (shortens), it pulls the bone, and the other muscle in the pair relaxes. To reverse the movement, the first muscle relaxes while the second one contracts.

5. Fill in the blank: The type of joint found in the wrist that allows circular movement is a _____ joint.

Gliding

6. Why are the joints in our skull considered fixed joints?

The joints in our skull do not allow any movement, which is essential to protect the brain.

7. Name three different types of joints found in the human body.

Ball-and-socket joint, Hinge joint, and Pivot joint.

8. What is the role of the skeleton in our body?

The skeleton gives our body its shape, provides a framework, and protects our internal organs.