Choose the most appropriate answer from the following options.
 
1. Which structure acts as the integration center in a reflex arc?
 
2.  Which of the following statements are true?

(i) Reflex actions help protect the body from harmful stimuli
(ii) Sensory neurons carry impulses from spinal cord to receptors
(iii) Muscles act as effector organs in reflex actions
(iv) Reflex actions occur quickly without conscious control