Our body is like a big machine that works all the time. It helps us walk, talk, eat, breathe, and do many other things. But do you know how our body does all this?
Inside our body, there are many parts that work together. These parts are called organs. Some important organs are the heart, brain, lungs, and stomach. When many organs work together to do a special job, they form an organ system.
For example:
- The digestive system helps us eat and digest food.
- The respiratory system helps us breathe.
- The circulatory system carries blood all over the body.
Just like a team, all organ systems work together to keep us healthy and strong. In this chapter, we will learn about different organ systems and how they help us every day!
Structure of the Human Body
The human body is made up of many tiny building blocks called cells. When similar types of cells come together, they form a tissue. Different tissues work together to create organs.
- Organs like the stomach, liver, skin, and lungs are made up of different types of tissues.
- The human body is an amazing collection of different systems. Each system is made up of several organs that are connected to perform a specific function.
- These different systems work together to carry out essential functions that are important for our living and well-being.
The Skeletal System
The skeletal system is made up of bones that are connected to form a skeleton.
- Adults have 206 bones in their bodies, but some bones join together as we grow older.
- Bones are the hard and strong parts of our body, which helps in giving shape and support to our body.
Functions of the Skeletal System
- The skeletal system gives our body its shape and support. Without bones, our body would be shapeless.
- Our bones keep important body parts like the brain, heart, and lungs safe by covering them with a hard shell.
- The skull protects the brain, the ribcage keeps the heart and lungs safe, the backbone supports our body, and our arms and legs help us move.
Skeletal System
The Muscular System
The system that helps us to move different parts of our body is called the muscular system.
Functions of the Muscular System
- Muscles are soft parts that connect to bones and help us move, like blinking, walking, or jumping.
- Muscles also work inside our body – they make our heart beat and help move food in our stomach.
- Even our eyes and face move because of muscles. There are more than 600 muscles in our body!
Muscular System