Name parts of the organs involve in the reflex arc * ** *** Name parts of the organs involve in the reflex arc Describe how a reflex arc keeps us safe Explain what is happening in the reflex arc
Testing your reflexes
Check your pupillary reflex by looking at your pupils in a mirror, noting the size. Dim the lights for two to three minutes. Turn on the lights and reexamine your pupils in the mirror, noting their size. Normally, pupils get smaller when the lights are turned on because they contract to keep out excessive light that may temporarily blind you or damage your eyes.
Test your blink reflex by looking into a mirror. Bring your right palm toward your right eye quickly, stopping just short of making contact with your face. Repeat with the left palm and the left eye. Note if you did not blink.
Relax the fingers on your right hand completely to test the Hoffman response. Use the thumbnail on your left hand to press down on each of the fingernails of your right hand until your nail "clicks" over the end of each nail on your right hand. Repeat the exercise with the right thumbnail, checking each of the fingernails on the left hand. Note any discrepancies between fingers or hands. A lack of response is normal, according to the New York University website. Note an abnormal response, which is if your fingers flex after the click.
Check your plantar or Babinski reflex by sitting on a table with your legs hanging over the edge and your socks removed. Rub the end of the reflex hammer or an object like a key, up and down your bare foot from heel to big toe. Look for a slight flexing of your toes. Note any abnormal response, such as your toes separating or extending.
Click on the sensory neurone A C E D B F
Click on the spinal cord A C E D B F
Click on the stimulus A C E D B F
Click on the motor neurone A C E D B F
Click on the effector A C E D B F
Click on the receptor A C E D B F
Well done!
Relay neuron Sense organ Sensory neurone Motor neuron Muscle
Questions Are messages involved in reflexes fast or slow? Do the messages go all over the body or just to specific parts? How do the messages travel around the body? Is it easy to repair faulty nerves and reflexes? Can we give drugs in most cases of nerve failure? Imagine Andrew touched a hot Bunsen burner. Explain what is happening and why it happens
B1 Reflex: Acting without thinking Task Imagine that you jump in response to a loud noise while watching a scary movie. Use diagrams and a flow chart to show what happens in the body when it reacts suddenly. Include: The job of the brain, nervous system and reflexes. A flow diagram (model) to describe or explain a reflex arc. Include a diagram that shows the structure and function of a neurone.
B1 Reflex: Acting without thinking Progress through assessment Draft Read the Grade Ladder Attempt Task - aim for Target Grade Assessment Self, Peer or Teacher assessment Identify 1 or 2 improvement targets Improvement Make improvement(s) Teacher Assessment
When watching a scary movie and something unexpected happens, like a loud noise, we often ‘jump’. This is because our body responds to our surroundings. Can you explain what happens inside our body when we react in this way?
Flow Diagrams B1 Reflex: Acting without thinking Tips for attempting this task Flow Diagrams Use the boxes to show each stage Label the arrows to show what links each stage e.g. stimulus e.g. sensory neurone
B1 Reflex: Acting without thinking Towards C Grade Target KEY WORDS stimulus sensory neurone relay neurone synapses stimuli effector response When you let go of a hot pan... What is the stimulus? What is the response? What is the effector? D. Put the key words in order to show a reflex arc.
Beyond C Grade KEY WORDS stimulus sensory neurone relay neurone B1 Reflex: Acting without thinking Beyond C Grade Beyond C Grade KEY WORDS stimulus sensory neurone relay neurone synapses stimuli effector response Label the neurone. Identify where a synapse occurs. Put the key words in order to show a reflex arc.