which one of the following statements about reflexes is true? reflexes always have only the one synapse. reflexes always have skeletal muscle as the effector. reflexes are only seen in the somatic nervous system. reflexes require information to be detected by receptors.

A reflex arc is a special type of neural circuit that begins in sensory neurons in receptors (such as pain receptors in fingertips) and ends in motor neurons in effectors (such as skeletal muscles). Sensory neurons send electrical impulses to relay neurons in the CNS spinal cord. Motor neurons send electrical impulses to effectors. An effector produces a response (muscle contracts to move hand away).

The simplest assembly of the reflex arc consists of receptors, interneurons (or adjusters), and effectors. Together these units form a functional group. Sensory cells transmit input (afferent impulses) from receptors to central interneurons, which in turn make contact with motor neurons.

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