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.

ReceptorStimulus

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

BaroreceptorsPressure in blood vessels

Chemo receptorsChemical stimuli

Electromagnetic radiation receptorsElectromagnetic radiation

ElectroreceptorsElectrofields

HydroreceptorsHumidity

Infrared receptorsInfrared radiation

MagnetoreceptorsMagnetic fields

MechanoreceptorsMechanical stress or strain

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

OsmoreceptorsOsmolarity of fluids

PhotoreceptorsVisible light

ProprioceptorsSense of position

ThermoreceptorsTemperature

Ultraviolet receptorsUltraviolet radiation

gametes or germ cells are haploid cells (example: sperm and ova) containing only one set (or n) number of chromosomes and autosomal or somatic cells are diploid cells containing 2n number of chromosomes.