Reflexes

• What is a reflex?

  An automatic response to a stimulus
• What is the purpose of reflex actions?

  To protect the body from harmful stimuli
• Where do reflex actions occur in the body?

  In both the brain and spinal cord
• How does a reflex action differ from a voluntary action?

  Reflex actions occur automatically without conscious thought
• What type of neuron carries the impulse from the receptor to the spinal cord in a reflex arc?

  Sensory neuron
• What happens during a withdrawal reflex, such as when you touch something hot?

  The sensory neuron sends a message directly to the spinal cord, and the motor neuron causes the muscles to contract
• What is the function of a reflex arc?

  To provide an immediate response to a stimulus, often for protection
• Which of the following reflexes is controlled by the spinal cord and does not require input from the brain?

  Knee-jerk reflex
• Why are reflex actions important for survival?

  They allow fast, automatic responses to harmful stimuli