Nervous system
Cardiovascular system
Digestive system
Reproductive system
Fact or myth?
100
This organ controls the entire body and weighs around three pounds in adults.
What is the brain?
100
These blood vessels can look blue, green, or brown in our wrists and hands. They carry blood back to the heart from other parts of the body.
What are veins?
100
When we are hungry or smell good food, our mouths produce this watery fluid that starts the digestive process.
What is saliva?
100
This is the term for suddenly growing taller or putting on weight during puberty.
What is a growth spurt?
100
Fact or myth: making an effort to breathe evenly and slowly helps us think clearer when nervous or angry.
What is a fact?
200
Name three of the five senses that give us information about our environment.
What are sight, hearing, smell, taste, touch?
200
This disease develops when the heart has to work extra hard to pump blood around the body. It is measured by an inflating arm cuff at the doctor's office.
What is high blood pressure (hypertension)? 
200
Name two vitamins or minerals that we get from our food.
What are vitamins (A-K), calcium, iron...
200
This is a well-known male reproductive hormone, although all humans have some amount of it.
What is testosterone?
200
Fact or myth: wearing a mask or covering our mouth with an elbow when we cough doesn't actually prevent germs from reaching other people and objects.
What is a myth?
300
This hormone is responsible for "fight-or-flight" responses in stressful or exciting situations; it can cause increased heart rate and blood pressure, heavy breathing, and sweating.
What is adrenaline?
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300
When we breathe in and out, blood picks up this gas from the air to carry around our bodies.
What is oxygen?
300
This organ filters our blood to break down things like medicine, alcohol, and old cells.
What is the liver?
300
During ovulation, this organ releases an egg cell (about once a month).
What is an ovary?
300
Fact or myth: there are techniques you can use to make yourself "sober up" faster.
What is a myth?
400
This is the name for a brain injury caused by a bump or jolt to the head, often occurring during sports, fights, or accidents.
What is a concussion?
400
Name two of the four blood types.
What are A, B, AB, O?
400
Although it can sometimes cause heartburn, this stomach liquid is important for breaking down food we have eaten.
What is stomach acid?
400
Family planning helps people make this important decision about their future.
What is when or how to have children?
400
Fact or myth: the brain continues most of its activities while we sleep.
What is a fact?
500
Research suggests this part of the brain controls our decision-making and is still developing until we turn twenty-five.
What is the frontal lobe?
500
By decreasing how much oxygen the heart and brain get, smoking increases the risk of these two major health events.
What are heart attacks and strokes?
500
People with this digestive problem may feel sick or uncomfortable after eating dairy products like cheese, milk, and ice cream.
What is lactose intolerance?
500
Serena Williams and millions of other Americans live with PCOS, which is a disease where the ovaries malfunction because of higher levels of this "male" hormone.
What is testosterone?
500
Fact or myth: drinking four cups of water and four cups of coffee will hydrate you the same amount.
What is a myth?