Integrators in the nervous system are responsible for processing sensory information and coordinating responses. In this context, the main integrators are:
a) Brain and Spinal Cord: These are the central components of the nervous system. The brain processes sensory information, makes decisions, and sends commands to the rest of the body. The spinal cord acts as a conduit for signals between the brain and the peripheral nervous system.
b) Muscles and Glands: While muscles receive signals to contract and glands release hormones as a response, they are not integrators. They are effectors that carry out the commands issued by the brain.
c) Sensory Cells in Eye, Tongue, and Ear: These cells detect stimuli but are not integrators themselves. They are sensory receptors that transduce physical signals into neural impulses.
d) Bones: Bones serve as structural support and do not play a role in integration or processing sensory information.
e) None of These: This option is incorrect as the brain and spinal cord are indeed integrators.
Therefore, the correct examples of integrators are the brain and spinal cord, making a the right choice.