Lesson Note On The Human Body For Primary 4

Lesson Title: The Human Body

Time: 45 minutes

Lesson Objectives

By the end of the lesson, students should be able to: 

  • Identify the major organs and systems of the human body.
  • Explain the functions of the major organs and systems of the human body.
  • Distinguish between the different types of tissues in the human body.
  • Describe the process of growth and development of the human body.
  • Appreciate the importance of good health and hygiene.
  • Compare and contrast the different body systems.
  • Identify the different types of cells in the human body.
  • Create a model of the human body.

Instructional Materials

  1. Pictures or models of the human body
  • Worksheets on the human body
  • Construction materials (such as cardboard, paper, and other materials)


  • List of the major organs and systems in the human body:
  1. Organs
  1. Heart
  1. Brain
  1. Lungs
  1. Stomach
  1. Liver
  1. Kidneys
  • Systems
  1. Circulatory System (heart and blood vessels)
  1. Respiratory System (lungs)
  1. Digestive System (stomach and intestines)
  1. Nervous System (brain and nerves)
  1. Urinary System (kidneys and bladder)
  • Functions Of Organs And Systems¬†

Here’s a more detailed explanation of the functions of the major organs and systems in the human body:

  • Organs
  1. Heart

Function: The heart is a muscular organ that pumps blood throughout the body. It sends oxygen-rich blood to the body’s cells and tissues, ensuring they receive the nutrients and oxygen they need to function properly.

  1. Brain

Function: The brain is the control center of the body. It processes information from our senses, controls our thoughts, emotions, and memories, and coordinates all the body’s activities.

  1. Lungs

Function: The lungs are responsible for breathing. They take in oxygen from the air we breathe and release carbon dioxide, a waste gas, when we exhale. Oxygen is then carried by the blood to cells for energy production.

  1. Stomach:

Function: The stomach is part of the digestive system and plays a role in breaking down food. It mixes food with digestive juices, creating a mixture called chyme, which is gradually released into the small intestine for further digestion and nutrient absorption.

  1. Liver

Function: The liver is a vital organ that performs many functions. It detoxifies harmful substances from the blood, produces bile for digestion, stores nutrients and energy, and helps regulate blood sugar levels.

  1. Kidneys

Function: The kidneys are responsible for filtering waste products and excess water from the blood, forming urine that is eventually eliminated from the body. They also help regulate electrolyte balance and blood pressure.

  • Systems
  1. Circulatory System

Function: This system includes the heart and blood vessels. It transports oxygen, nutrients, hormones, and other vital substances throughout the body. It also helps remove waste products, such as carbon dioxide, from cells.

  1. Respiratory System

Function: Comprising the lungs and airways, this system facilitates the exchange of oxygen and carbon dioxide between the air and the blood. It provides the body with oxygen for energy production and eliminates waste carbon dioxide.

  1. Digestive System:

Function: This system includes organs like the stomach, intestines, and liver. It breaks down food into nutrients that can be absorbed by the body, provides energy, and removes waste products through processes like digestion and absorption.

  1. Nervous System

Function: The nervous system controls and coordinates all bodily activities. It receives and interprets sensory information, sends signals to muscles and organs, and plays a role in emotions, thoughts, and memory.

  1. Urinary System

Function: Comprising the kidneys, bladder, and associated structures, this system eliminates waste products and excess substances from the blood to form urine. It helps regulate water and electrolyte balance as well.

  • Types Of Tissues In The Human Body.

Here are some Types of tissues in the human body, each with its own distinct structure and function:

  • Epithelial Tissue:

Structure: Epithelial tissue is made up of closely packed cells arranged in layers. It covers the body’s surfaces and lines various organs and cavities.

Function: Epithelial tissue serves as a protective barrier, preventing the loss of fluids and invasion by pathogens. It also participates in absorption, secretion, and sensation. Different types of epithelial tissue can be found in the skin, lining of the digestive tract, and lining of blood vessels.

  • Connective Tissue

Structure: Connective tissue consists of cells dispersed in a matrix of protein fibers and ground substance. The matrix can be rigid or fluid, depending on the type of connective tissue.

Function: Connective tissue provides support, protection, and structure to various parts of the body. It includes a wide range of tissues such as bone, cartilage, blood, adipose (fat) tissue, and tendons. Each type has its own specialized function, like storing energy, forming a scaffold, or transporting nutrients.

  • Muscle Tissue

Structure: Muscle tissue is composed of cells called muscle fibers that contract and generate force.

Function: Muscle tissue is responsible for movement. There are three types of muscle tissue: skeletal muscle (voluntary movement), smooth muscle (involuntary movement of internal organs), and cardiac muscle (contractions of the heart).

  • Nervous Tissue

Structure: Nervous tissue consists of specialized cells called neurons and supporting cells called glial cells.

Function: Nervous tissue transmits electrical signals called nerve impulses, which allow for communication and coordination within the body. It forms the basis of the nervous system, enabling sensory perception, motor control, and cognitive processes.

  • Growth and Development of the Human Body
  1. Baby Beginnings

When a baby starts to form, it begins as a tiny cell from a mom and a dad. This cell grows into a little baby inside the mom’s tummy.

The baby’s body starts to take shape, and its organs begin to form.

  1. Getting Bigger

As the baby grows, it gets bigger and bigger inside the mom’s tummy.

The baby’s body parts, like arms, legs, and a head, become more defined.

  1. Coming Out

When it’s time, the baby comes out of the mom’s tummy. This is when people say the baby is born.

The baby is small and needs lots of care. It learns to eat, move, and do new things.

  1. Growing Up

Babies grow into kids, and kids grow into adults. This is called growing up.

Kids learn to walk, talk, and do many things by themselves.

  1. Changes in Teens

When kids become teenagers, their bodies change a lot. They get taller, their voices might change, and they start to look more like adults.

  1. Becoming Adults

As teenagers get older, they become adults. Adults are taller and stronger.

They can do many things and take care of themselves.

  1. Growing Older

When adults get even older, their bodies start to slow down. They might get wrinkles and need to rest more.

People get wiser as they get older, and they have lots of stories to tell.

So, from being a tiny baby to growing into a strong adult, our bodies change a lot as we grow and learn new things!


Begin by reviewing the major organs and systems of the human body. Show pictures or models of the organs and systems, and ask students to name them.

Explain the functions of the major organs and systems of the human body. How do they work together to keep us alive?

Compare and contrast the different body systems. What are their similarities and differences?

Identify the different types of tissues in the human body. What are their shapes, sizes, and functions?

Describe the process of growth and development of the human body from conception to adulthood. What changes happen to our bodies as we grow up?

Appreciate the importance of good health and hygiene by practicing good personal hygiene habits. Why is it important to keep our bodies clean and healthy?

Have students create a model of the human body using cardboard, paper, and other materials. They will need to label the different parts of the body and explain their functions.


  1. Identify three major organs and systems of the human body.
  1. Explain the two functions of the major organs and systems of the human body.
  1. Distinguish between two types of tissues in the human body.

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