Introduction
Our body is able to move thanks to bones and muscles. Movement is important for daily activities, sports, and survival. The study of body movements helps us understand the skeletal and muscular system.
Bones and Skeleton
- Bones provide shape, support, and protection to the body.
- All the bones together form the skeleton.
- Humans have 206 bones in adulthood.
Functions of the Skeleton
- Gives shape and support to the body
- Protects vital organs like brain, heart, lungs
- Helps in movement by acting as a framework for muscles
Types of Joints
Joints are connections between two or more bones that allow movement.
- Ball and Socket Joint
- Allows movement in all directions
- Example: Shoulder, hip
- Hinge Joint
- Allows back and forth movement
- Example: Elbow, knee
- Pivot Joint
- Allows rotational movement
- Example: Neck (turning head)
- Fixed Joint
- Does not allow movement
- Example: Skull bones
Muscles
- Muscles are soft tissues that help bones move.
- Work in pairs: when one contracts, the other relaxes.
Types of Muscles
- Voluntary Muscles – We can control them consciously
- Example: Arm, leg muscles
- Involuntary Muscles – Work automatically
- Example: Heart, digestive system muscles
How Bones and Muscles Work Together
- Bones provide support
- Muscles contract and relax to move bones
- Example: Bending your arm involves the biceps and triceps
Summary
- Body movement is possible due to bones and muscles
- Skeleton protects organs and provides shape
- Joints allow different types of movement
- Muscles work in pairs to move bones
Important Questions (Short Answers)
1. What is the skeleton?
All the bones in the body that provide support and protection.
2. How many bones are there in the human adult body?
206
3. Name the main functions of the skeleton.
Support, protection, and movement.
4. What is a joint?
A connection between two or more bones that allows movement.
5. Name the types of joints.
Ball and socket, hinge, pivot, fixed.
6. Give an example of a ball and socket joint.
Shoulder or hip.
7. Give an example of a hinge joint.
Elbow or knee.
8. Give an example of a pivot joint.
Neck (turning the head).
9. Give an example of a fixed joint.
Skull bones.
10. What are muscles?
Soft tissues that help bones move.
11. How do muscles work?
In pairs: one contracts while the other relaxes.
12. Name the two types of muscles.
Voluntary and involuntary.
13. Give an example of a voluntary muscle.
Arm muscles.
14. Give an example of an involuntary muscle.
Heart or digestive muscles.
15. How do bones and muscles work together?
Bones provide support; muscles contract and relax to move bones.
16. Why is movement important for humans?
For daily activities, sports, and survival.