Nervous+System+PK

Nervous System Notes PK

Sense HW - PK

Chemoreceptors Proj.-PK Skeletal HW-PK

Muscular System-PK

The Nervous System



1. What are the two major divisions of the nervous system? - Two major divisions of the nervous system is the central nervous system and the peripheral nervous system.

2. What are the three types of neurons? - The three types of neurons are sensroy, interneuron and motor neuron.

3. What are the three parts of a neuron? - The three parts are the cell body, the dendrites and the axon.

4. What is a nerve impulse and how does it spread (this requires a long answer). - The nerve impulse is information spread through the nervous system. The nerve impule spreads through the sodium gares open for the NA+ to flow into the axon. This changes the membrane's action potential changes and the charge which is called depolarization. The potassium gates open and move out of the axon to cause repolarization to change the axon's charge back to negative.



5. Since neurons don't physically touch, how is an impulse transmitted from one neuron to the next? - The impulse is tranfoered through voltage energy.

6. What structures compose the central nervous system? - The structures are the spinal cord and the brain.

7. What are the two main functions of the spinal cord? - The two functions are to provide the communication between the brain and the peripheral nerves that leave the cord. Also, the spine is responsible for reflex actions.

8. What are the four major parts of the brain and the general function of each? - The cerebral cortex accounts for sensation, voluntary movement, and all thought processes, The cerebrum commincates with and coordinates the activities of other parts of the brain and also recieves sensory unput for voluntary motor responses. The primary somatosensorry area recoeves sensory informatio from the skin and skeletal muscles and also accounts for taste sensations. The association areas where integration occurs.