Reflexes
What is a reflex?
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  Facts
  • A reflex action is an automatic action that our body makes without us even having to think about it.
  • A reflex action is a survival technique that humans have.
  • Coughing when something gets caught in your throat is a reflex action.
  • Jumping when you get a fright (like Little Miss Muffet did with the spider) is a reflex action
  • Moving quickly away from something thatís causing you pain, like when you back into a prickle bush :o) is another reflex action.
  • Blinking when something moves quickly towards your face is a reflex action too.
  • The pupils in our eyes close and widen in a reflex action allowing only enough light into our eyes for us to see things clearly. The darker it is the wider our pupils grow.
 
  Did You Know?
  • Most of our reflexes have been developed over hundreds of thousands of years.
  • Reflex actions are often a response to something that could hurt us - thatís why we move so quickly.
  • When weíre reacting to pain the part of our body thatís feeling the pain sends a message straight to the part of our body that will move us away from that pain quickly bypassing our brain.
  • An action that we decide to make like to pick up a book and read or bite into an apple is called a voluntary action.
  • There are other movements that our body does all the time without us thinking about it like breathing and our heart working. These are called involuntary actions.
 
  Experiments
Test your reflexes

What you need:
A ruler
Someone to help you

What you do:
Hold out your hand and have someone hold the ruler above your hand so that itís pointing up and down towards the ground. Get your friend to drop the ruler and see how long it takes you to grab it. Youíll get an idea how long it takes by where you grab the ruler. Keep practising and see if you can get faster and grabbing the ruler.
 
  Investigation
Blink Reflexes

What you need:
A window
Some cotton wool balls
Someone to help you

What you do:
Have your friend stand on the other side of the window. Explain what youíre going to do. Gently through a cotton wool ball at the window at the level of their eyes and see if they blink. They may try really hard not to blink but itís a reflex action and they will probably blink every time.
 
  Jokes
Why did Little Miss Muffet need a road map?
She lost her whey.
From Kirstie
 









 
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