Muscles & Skeleton
Would you be able to move if you didn’t have bones? Why or why not?
You would not be able to move without your bones, because your muscles would have nothing to pull on. Your bones are the structure of your body.
You wouldn’t be able to move without bones because you’d just be a lump of skin and guts on the floor!
Why do some people have blurry vision?
Some people have blurry vision because their eyeball is too short or too long.
Some people have blurry vision because the back of their eye is just a little bit too far or a little bit too close to the front of the eye. When this happens the image is blurry, not focused
Why does your pupil get larger when the room is dark?
Your pupil gets larger so that more light comes into your eye. This helps you see better in the dark.
Why does it look like you have a hole in your hand when you try the hole-in-hand illusion?
It looks like that because one eye sees a hole and the other eye sees your hand. Your brain combines the two.
It looks like that because your brain sees out of both eyes.
Why do you think that scientists find dissection useful for learning how the body works?
Scientists find dissection useful for learning how the body works because dissection lets us look inside and really see what’s going on.
Dissection is useful because we can see the insides of the body.
What is the purpose of an iris?
The iris expands and shrinks to let the light go through the pupil.
How do nocturnal animals see better in the dark than we can?
Nocturnal animals pupils can get larger than our pupils. Nocturnal animals also have a colored layer at the back of their eye that helps them see more light.
What is the difference between your movement nerves and your sensory nerves? What do they do?
Your movement nerves are how your brain controls your muscles. They go from your brain out to your muscles. Your sensory nerves are how your brain gets messages from your senses. They go from your senses to your brain.
How does the human body work like a robot?
Our bodies are similar to robots in many ways. We have rods and strings for movement. These are bones and tendons. We also have to run on energy. For that we use food. And our brain is like a computer inside us.
Our bodies are like robots because we have little strings and rods, just like the robot hand.
What would happen if your cornea-lens were cloudy instead of clear? What would you see?
If the cornea-lens were cloudy you wouldn’t see well. Things would look blurry.
If the cornea-lens were cloudy you wouldn’t see things. Instead, you would only be able to tell light from dark.
Why does it sometimes look like people have red eyes when their picture is taken using a camera’s flash?
People’s eyes look red because the camera flash is lighting up the blood vessels at the back of our eyes.
Explain what happened as you did the “Reaction Time” activity.
The eyese sent a message tothe brain "here is a ruler."
The brain made a decision to grab the ruler.
The brain sent a message to the movement nerves, "grab it!"