How does our body work

Take a tour of its amazing parts with Chloe and Nurb! How the Body Works Learn more about your body parts with these articles — perfect for school assignments! How the Body Works Test your body knowledge with our quizzes. How the Body Works How many hairs are on your head? Pause Slideshow. The Immune System Watch how your immune system fends off germs and learn what you can do to boost its power. The male reproductive system includes the penis and the testes, which produce sperm.

The female reproductive system consists of the vagina, the uterus and the ovaries, which produce eggs. During conception, a sperm cell fuses with an egg cell, which creates a fertilized egg that implants and grows in the uterus. Our bodies are supported by the skeletal system , which consists of bones that are connected by tendons, ligaments and cartilage. The skeleton not only helps us move, but it's also involved in the production of blood cells and the storage of calcium. The teeth are also part of the skeletal system, but they aren't considered bones.

The respiratory system allows us to take in vital oxygen and expel carbon dioxide in a process we call breathing. It consists mainly of the trachea, the diaphragm and the lungs. The urinary system helps eliminate a waste product called urea from the body, which is produced when certain foods are broken down. The whole system includes two kidneys, two ureters, the bladder, two sphincter muscles and the urethra. Urine produced by the kidneys travels down the ureters to the bladder, and exits the body through the urethra.

The skin, or integumentary system , is the body's largest organ. It protects us from the outside world, and is our first defense against bacteria, viruses and other pathogens. Your skeletal system relies on the nutrients it gains from your digestive system to build strong, healthy bones.

A body system is a group of parts that work together to serve a common purpose. Your cardiovascular system works to circulate your blood while your respiratory system introduces oxygen into your body.

Each individual body system works in conjunction with other body systems. The circulatory system is a good example of how body systems interact with each other. Your heart pumps blood through a complex network of blood vessels. When your blood circulates through your digestive system, for example, it picks up nutrients your body absorbed from your last meal.

Your blood also carries oxygen inhaled by the lungs. Your circulatory system delivers oxygen and nutrients to the other cells of your body then picks up any waste products created by these cells, including carbon dioxide, and delivers these waste products to the kidneys and lungs for disposal. Also discuss the major systems of the human body and their functions. Use the human torso to point out the different internal organs. Read or sing Skeletal Hip Hop with your students.

Discuss the skeletal and muscular systems of the human body. The skeletal model can help you show the different parts.

Have the students find some of the bones figured on the placemat on their body. Bone tissue varies in hardness.