Human Body Parts
Grade 1 · Science · Study Guide
Take a tour of your amazing body and discover what each part does!
Your body is the most amazing machine in the world! It has many different parts, and each part has an important job to do. Together, all your body parts work as a team to keep you healthy, moving, and growing every day.
Your skeleton is made of bones that hold you up and protect your soft insides. Your muscles are attached to your bones and help you move, run, jump, and hug people. Your heart is a muscle that pumps blood all around your body. Your lungs take in air so your body can get the oxygen it needs.
Your brain is the boss of your whole body — it thinks, remembers, and controls everything else. Your senses — sight, hearing, smell, taste, and touch — send information from the outside world to your brain so you can understand what is happening around you.
| Body Part | What It Does |
|---|---|
| Brain | Thinks and controls the whole body |
| Heart | Pumps blood to all parts of the body |
| Lungs | Breathe in air and take in oxygen |
| Bones | Hold the body up and protect organs |
| Muscles | Help the body move |
Key terms
- skeleton
- All the bones in your body that support you and protect your organs.
- muscles
- Body parts that pull on bones to make you move.
- heart
- The muscle that pumps blood around your body.
- lungs
- Organs in your chest that fill with air to give your body oxygen.
- brain
- The organ in your head that controls thinking, feeling, and all body functions.
Flashcards
- brain
- Controls thinking, feelings, and every function in your body.
- heart
- A muscle that pumps blood through your entire body.
- lungs
- Take in oxygen when you breathe in and remove carbon dioxide when you breathe out.
- bones
- Hard structures that form your skeleton, hold you up, and protect organs.
- muscles
- Tissues that contract and relax to move your body parts.
- senses
- The five ways you take in information: sight, hearing, smell, taste, and touch.
Practice questions
What does your heart do?
- Helps you think
- Pumps blood around your body
- Helps you breathe
- Holds your body up
Show answer
Answer: Pumps blood around your body
The heart is a powerful muscle that beats continuously to move blood — carrying oxygen and nutrients — to every cell in your body.
Your bones protect your soft organs inside your body.
Show answer
Answer: True
Your skull protects your brain, your ribcage protects your heart and lungs, and your spine protects the spinal cord.
Which body part is the boss of everything else?
- Heart
- Lungs
- Brain
- Stomach
Show answer
Answer: Brain
The brain receives signals from all senses, makes decisions, and sends commands to the rest of the body.
Muscles help you move by pushing and pulling on your bones.
Show answer
Answer: True
Muscles are attached to bones by tendons; when muscles contract or relax, they pull bones to create movement.
Your ___ fill with air to bring oxygen into your body.
Show answer
Answer: lungs
Your two lungs expand as you breathe in, filling with air. They transfer oxygen into the blood and remove carbon dioxide waste.
Fun facts
- Your heart beats about 100,000 times every single day!
- You have 206 bones in your body — babies are born with about 300, but some fuse together as you grow!
- Your brain never stops working — not even when you sleep!
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