Which of the following statements are true?
(i) Sudden reaction in response to the stimulus is called the reflex action.
(ii) Sensory neurons carry signals from the spinal cord to the muscles.
(iii) Motor neurons carry signals from the receptors to the spinal cord.
(iv) The path through which signals are transmitted from a receptor to a muscle or a gland is called a reflex arc.
(i) and (iv)
A reflex action is a quick response to a specific stimulus and the path taken by a nerve impulse in a reflex action is called a reflex arc. Sensory neurons carry signals from receptors to the spinal cord, and motor neurons carry signals from the spinal cord to an effector organ (muscle or gland).