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Biology for Kids

Human Body

The human body is a complex biological system involving cells, tissues, organs, and systems all working together to make up a human being.

Science Human Body Art
Human Body
Source: openclipart.org
Main Structures

From the outside, the human body can be divided into several main structures. The head houses the brain which controls the body. The neck and trunk house many of the important systems that keep the body alive and healthy. The limbs (arms and legs) help the body to move about and function in the world.


The human body has five main senses that it uses to convey information about the outside world to the brain. These senses include sight (eyes), hearing (ears)Hearing and the Ear, smell (nose), taste (tongue), and touch (skin).

Organ Systems

The human body consists of several organ systems. Each system is made up of organs and other body structures that work together to perform a specific function. Most scientists divide the body into 11 systems.
  1. Skeletal System - The skeletal system is made up of bones, ligaments, and tendons. It supports the overall structure of the body and protects the organs.

  2. Muscular System - The muscular system works closely with the skeletal system. Muscles help the body to move and interact with the world.

  3. Cardiovascular/Circulatory System - The circulatory system helps deliver nutrients throughout the body. It consists of the heart, blood, and blood vessels.

  4. Digestive System - The digestive system helps to convert food into nutrients and energy for the body. Some of the organs included in the digestive system are the stomach, small intestine, large intestine, liver, and pancreas.

  5. Nervous System - The nervous system helps the body to communicate and allows the brain to control various functions of the body. It includes the brain, spinal cord, and a large network of nerves.

  6. Respiratory System - The respiratory system brings oxygen into the body through the lungs and windpipe. It also removes carbon dioxide from the body.

  7. Endocrine System - The endocrine system produces hormones that help regulate the other systems in the body. It includes the pancreas, adrenal glands, thyroid, pituitary, and more.

  8. Urinary System - The urinary system uses the kidneys to filter the blood and eliminate waste. It includes the kidneys, bladder, and urethra.

  9. Immune/Lymphatic System - The lymphatic and immune systems work together to protect the body from diseases.

  10. Reproductive System - The reproductive system includes the sex organs that enable people to have babies. This system is different for males and females.

  11. Integumentary System - The integumentary system helps protect the body from the outside world. It includes the skin, hair, and nails.
Cells, Tissues, and Organs

Like all living organisms, the human body is made up of cells. There are all different types of cells in the human body. When lots of similar cells work together to perform a function, they make up tissue. There are four main types of tissue in the human body including muscle tissue, connective tissue, epithelial tissue, and nervous tissue.

Organs are somewhat independent parts of the body that carry out special functions. They are made up of tissues. Examples of organs include the eyes, heart, lungs, liver, and stomach.

Interesting Facts about the Human Body Activities

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More Biology Subjects

The Cell
Cell Cycle and Division

The Human Body
Human Body
Nervous System
Digestive System
Sight and the Eye
Hearing and the Ear
Smelling and Tasting
Blood and Heart
List of Human Bones
Immune System

Vitamins and Minerals

Mendel and Heredity
Hereditary Patterns
Proteins and Amino Acids

Plant Structure
Plant Defenses
Flowering Plants
Non-Flowering Plants
Living Organisms
Scientific Classification

Infectious Disease
Medicine and Pharmaceutical Drugs
Epidemics and Pandemics
Historical Epidemics and Pandemics
Immune System

Science >> Biology for Kids

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