1. Name the two major divisions of the nervous system; list the organs/tissues found in each.
2. Name the two divisions of the peripheral nervous system (PNS), and give the primary function of each.
3. List at least seven stimuli that would trigger sensory receptors.
4a) Choose one stimulus from Q. 3, and describe in a complete sentence how the stimulus would travel to the central nervous system (CNS).
4b) Describe in 1-2 complete sentences how the motor commands from the CNS would travel to the effector target organ or tissue. Tell if the motor command will travel via the somatic or autonomic nervous system; explain why.
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5. Choose another stimulus from Q. 3 that will initiate a CNS motor response that will travel via the other motor division (SNS/ANS) of the peripheral nervous system (PNS) described in Q. 5. Explain your reasoning.

1.Structural Divisions of the Nervous System. The nervous system can be divided into two major regions: the central and peripheral nervous systems. The central nervous system (CNS) is the brain and spinal cord, and the peripheral nervous system (PNS) is everything else.

2.Like the nervous system as a whole, the peripheral nervous system also has two divisions: the sensory division and the motor division. The sensory division of the PNS carries sensory information from the body to the central nervous system.

3.Sensory receptors with corresponding stimuli to which they respond.

Receptor Stimulus

Apmullae of Lorenzini (primarily function as electroreceptors) Electric fields, salinity, and temperature

Baroreceptors Pressure in blood vessels

Chemo receptors Chemical stimuli

Electromagnetic radiation receptors Electromagnetic radiation

Electroreceptors Electrofields

Hydroreceptors Humidity

Infrared receptors Infrared radiation

Magnetoreceptors Magnetic fields

Mechanoreceptors Mechanical stress or strain

Nociceptors Damage or threat of damage to body tissues (leads to pain perception)

Osmoreceptors Osmolarity of fluids

Photoreceptors Visible light

Proprioceptors Sense of position

Thermoreceptors Temperature

Ultraviolet receptors Ultraviolet radiation