Human Body
How many bones are in the human body?
206
What force keeps us from floating off the earth
Gravity
What is the name of the star that our solar system orbits?
Sun
About how much does the average adult human brain weigh?
3 pounds
How many times does the human heart beat in one day?
About 100,000
How long does it take earth to rotate once on its axis?
24 Hours
Which planet has the strongest winds in our solar system?
Neptune
How many neurons are in the brain?
86 billion
How many miles of blood vessels are estimated to be in the average adult human body?
About 60,000 miles
What protects life on earth from much of the suns harmful ultraviolet radiation?
The ozone layer
Which planet is closest to the sun
Mercury
What protects the brain from physical injury
The skull
What organ can regenerate a significant amount of its lost tissue?
The liver
About how many degrees is earth's axis tilted?
23.5 degree
What keeps planets from crashing into the sun
Orbital motion combined with the suns gravity
What cushions the brain inside the skull
Cerebrospinal fluid
Your body has to maintain a relatively stable internal environment even when conditions outside change. What is this process called?
Homeostasis
What causes day and night?
Earths rotation
How far is earth from the sun?
93 million miles
Your brain needs a constant supply of what two things to function properly?
Oxygen and glucose.