Share 7th Grade Human Bio Review
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What organ pumps blood around the body?
The heart
How many lungs do most humans have?
Two
What gas do we breathe in?
Oxygen
What gas do we breathe out?
Carbon dioxide
What is the largest organ in the human body?
The skin
Which organ helps you think and remember?
The brain
What carries blood away from the heart?
Arteries
What carries blood back to the heart?
Veins
What system helps us breathe?
Respiratory system
What system breaks down food?
Digestive system
Why is blood important?
It carries oxygen, nutrients, and removes waste.
What is the job of the skeleton?
Support, protection, and movement.
Why do we need muscles?
To move our body.
What organ cleans our blood?
Kidneys
What happens in the stomach?
Food is mixed with acid and broken down.
What protects the brain?
The skull
