Reflexes

Question 1

What is a relex action? When does it occur?

Answer 1

• a reflex is an involuntary response to a sensory stimulus
• when the body is in danger, it can respond to situations without conscious though

Question 2

Why do we have reflexes?

Answer 2

causes a faster response, preventing or minimising damage to the body

Question 3

What is the reflex arc?

Answer 3

• the pathway of neurones involved in a reflex action

Question 4

What are the steps in the reflex arc?

Answer 4

• receptor
  
  • detect stimulus
  • creates an action potential in the sensory neurone
• sensory neurones
  
  • carries impulse to spinal cord
• relay neurone
  
  • connects the sensory neurone to the motor neurone within the spinal cord or brain
• motor neurone
  
  • carries impulse to the effect to carry out the appropriate resonse
• effects
  
  • muscle or gland

Question 5

What is the spinal cord?

Answer 5

• a column of nervous tissues running up the back
• surrounded by the spine for protection
• at intervals along the spinal cord neurones emergy