🦴 Lesson Note: The Human Skeletal System

Subject: Basic Science
Class: Basic 4
Topic: Human Skeletal System
Duration: 40 minutes

Learning Objectives

At the end of the lesson, pupils should be able to:

Explain what the skeletal system is.
State the importance of the human skeleton.
Identify some major bones in the human body.
Describe the functions of bones.
Explain how to keep bones healthy.

1. What is the Skeletal System?

The skeletal system is the framework of bones that gives shape and support to our body.

The human body has 206 bones in an adult. Children have more bones because some bones join together as they grow.

The bones are connected to form the skeleton.

2. Parts of the Human Skeleton

The skeleton is made up of many bones. Some important ones are:

A. Skull

The skull is the group of bones that forms the head.

Function: It protects the brain.

B. Backbone

The backbone, also called the spine, runs from the neck down the back.

Function: It supports the body and protects the spinal cord.

C. Rib Cage

The rib cage is made up of curved bones around the chest.

Function: It protects important organs such as the heart and lungs.

D. Arm Bones

The bones of the arms help us to move and use our hands.

Some important arm bones include the humerus, radius, and ulna.

E. Leg Bones

The bones of the legs help us to stand, walk, run, and jump.

The femur is the long bone in the upper leg.

3. Functions of the Skeleton

The skeleton performs many important functions.

1. It Gives Shape to the Body

Our bones provide a framework that gives our body its shape.

2. It Supports the Body

The skeleton supports the body and helps us to stand upright.

3. It Protects Internal Organs

Some bones protect delicate organs.

For example:

Skull → protects the brain
Rib cage → protects the heart and lungs
Backbone → protects the spinal cord

4. It Helps Movement

Bones work together with muscles and joints to help us move.

They allow us to:

Walk
Run
Jump
Bend
Sit
Lift things

5. It Helps Produce Blood Cells

Some bones contain bone marrow, where many blood cells are produced.

4. Bones and Joints

A joint is the place where two or more bones meet.

Examples include:

Knee joint
Elbow joint
Shoulder joint
Hip joint

Joints allow different parts of our body to move.

For example, the elbow allows us to bend and straighten our arm.

5. How to Keep Our Bones Healthy

We can keep our bones strong and healthy by:

Eating foods rich in calcium, such as milk, yoghurt, and some fish.
Eating a balanced diet.
Getting enough vitamin D.
Taking part in regular physical activities.
Maintaining good posture.
Avoiding dangerous activities that may cause bone injuries.
Wearing appropriate protective equipment during sports.

⭐ Important Bones to Remember

Bone	Location	Main Function
Skull	Head	Protects the brain
Backbone/Spine	Back	Supports body and protects spinal cord
Ribs	Chest	Protect heart and lungs
Humerus	Upper arm	Helps arm movement
Femur	Upper leg	Supports the leg and helps movement

🧠 Let’s Remember

Skeleton = framework of bones in the body.

Skull → Brain

Ribs → Heart and lungs

Backbone → Spinal cord

Femur → Upper leg

Joints → Help bones move

📝 Class Activity

Ask pupils to point to these parts of their bodies:

Skull
Shoulder
Elbow
Rib cage
Backbone
Hip
Knee
Ankle

Then ask:

Which bones protect the brain?
Which bones protect the heart and lungs?
Which bone is found in the upper leg?
What is a joint?

🎯 Evaluation Questions

What is the skeletal system?
What is a skeleton?
Mention five bones or groups of bones in the human body.
What is the function of the skull?
What does the rib cage protect?
What is the backbone?
What is a joint?
State three functions of the skeletal system.
Mention three ways of keeping our bones healthy.
Which bone is found in the upper leg?

🏠 Homework

Draw a simple human skeleton and label these five parts:

Skull
Backbone
Ribs
Humerus
Femur