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7th Grade Human Bio Review
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Which side of your brain controls the right side of your body?
The left side of the brain.
Why do your ears pop on an airplane?
Air pressure changes inside and outside the ear.
Why do we shiver when we are cold?
Muscles contract rapidly to produce heat.
Can a muscle push a bone?
No. Muscles only pull.
What happens when muscles work?
They contract (shorten) and pull on bones.
Why do your pupils get bigger in the dark?
To let more light into the eye.
Which part of your eye detects light?
The retina
Why is it difficult to read in a dark room?
Not enough light reaches the retina.
Which part of the eye changes shape to help you focus on objects near and far?
The lens
Why can't you sneeze with your eyes open?
Your brain automatically closes them as a protective reflex.
Which body system helps protect you from diseases?
The immune system
Which part of your body keeps growing your entire life?
Your nose and ears continue to grow slowly.
How many liters of blood does the average adult have?
 
A) 1 liter
 
B) 5 liters
 
C) 20 liters
Which organ uses about 20% of your body's energy even though it is only 2% of your weight?
The brain
Why do astronauts lose muscle strength in space?
Because there is very little gravity.
Why is drinking water important for your body?
It helps transport nutrients, regulate temperature, and keep organs working.
What is the strongest muscle in the body based on force?
Jaw muscle (masseter)
Which side of the body is the heart mostly on?
Left side
How many bones are in an adult human body?
206
What is the only body part that cannot repair itself very well?
Tooth enamel
What muscle never stops working during your life?
The heart
True or False: Adults have more bones than babies.
False (Babies have more bones that later join together.)
Can you live with one kidney?
Yes
Which bone is longer: Your femur or your humerus?
Femur
Which blood cells help fight disease?
White blood cells
Why do we sweat?
To cool down our body.
What is a joint?
A place where two bones meet.
What is the smallest bone in the body?
The stirrup (stapes) in the ear
What protects the brain?
The skull
What happens in the stomach?
Food is mixed with acid and broken down.
What organ cleans our blood?
Kidneys
Why do we need muscles?
To move our body.
What is the job of the skeleton?
Support, protection, and movement.
Why is blood important?
It carries oxygen, nutrients, and removes waste.
What system breaks down food?
Digestive system
What system helps us breathe?
Respiratory system
What carries blood back to the heart?
Veins
What carries blood away from the heart?
Arteries
Which organ helps you think and remember?
The brain
What is the largest organ in the human body?
The skin
What gas do we breathe out?
Carbon dioxide
What gas do we breathe in?
Oxygen
How many lungs do most humans have?
Two
What organ pumps blood around the body?
The heart
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