Nervous+System+Homework+CC


 * Nervous System Homework**



1. Wh at are the two major divisions of the nervous system? The nervous system is made up of the Central Nervous System (CNS) and the Peripheral Nervous System (PNS).

2. What are the three types of neurons? The three types of neurons are the Bipolar neurons, the pseudounipolar neurons, and the multipolar neurons.

3. What are the three parts of a neuron? Nucleus, mitochondria, and the cytoplasm

4. What is a nerve impulse and how does it spread (this requires a long answer).

I nerve impulse is spread when a stimuli from outside the brain somehow comes in contact with the body. When it does this, the stimuli sends a reaction to the brain. From the brain comes the nerve impulses, which tell the body how to respond to the stimulate by using sensations.

5. Since neurons don't physically touch, how is an impulse transmitted from one neuron to the next? Saltatory conduction because the nerve impulses jump from node to node.

6. What structures compose the central nervous system? Spinal chord, the brain, and everything that makes up the brain and the spinal chord and the connection between the two.

7. What are the two main functions of the spinal cord? Provides a communication between the brain and the nerves that leave the spinal chord. It also controls reflexes.

8. What are the four major parts of the brain and the general function of each? The cerebrum is the largest part of human brains and it carries out integration before commanding voluntary motor responses. The Diencephalon circles the third ventricle. The cerebellum receives sensory input from the eyes, ears, joints and muscles. The Brain stem connects all the parts of the brain and is just part of the path to take responses and information from one part of the brain to the other, and finally into the spinal chord.