Nervous+System+hw+WB

1. What are the two major divisions of the nervous system? 2. What are the three types of neurons? 3. What are the three parts of a neuron? 4. What is a nerve impulse and how does it spread (this requires a long answer). 5. Since neurons don't physically touch, how is an impulse transmitted from one neuron to the next? 6. What structures compose the central nervous system? 7. What are the two main functions of the spinal cord? 8. What are the four major parts of the brain and the general function of each?

1. The two major devisions of the nervous system are the central nervous system and the peripheral nervous system.

2. The three types of neurons are sensory neurons, interneurons, and motor neurons.

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

4. A nerve impulse is basically what sends information in the nervous system. An impulse spreads through electrical currents. When resting, there is a charge of about -65mv. This is called resting potential. When a positive charge comes about, this is called action potential.

5. Although neurons don't touch, they are conveyed through neurotransmitters.

6. The spinal cord and the brain comprise the central nervous system.

7. The spinal cord serves as a means of communication between the peripheral nerves and brain.

8. The four main parts of the brain are the cerebrum, the cerebellum, the brain stem, and the diencephalon. The cerebrum controls memory, speech, and reasoning. The cerebellum controls the body. The brain stem controls vision, heartbeat, and breathing. The diencephalon helps to maintain homeostasis.