Nervous System facts

Answer 1

1. The nervous system is composed of the peripheral nervous system (PNS) and the central nervous system (CNS)
2. Every neuron has a cell body and nerve fibers.
3. Neurons can be classified three different ways regarding their structure.- 1. Bipolar- has two nerve fibers, one arising from each end. 2. Unipolar- has a single nerve fiber that extends from the cell body and then divided into two branches. 3. Multipolar- have many nerve fibers arising from the cell body
4. There are two types of nerve fibers. Dendrites transmit impulses to the cell body and the axon transmits impulses away from the cell body.
5. Many axons are covered with myelin. Myelin is largely composed of a lipid protein. It forms around the axon and protects it.
6. Their are cells in the nervous system called Neuroglial cells. These cells fill spaces, support neurons, provide framework for structure, produce myelin, and carry out phagocytosis.
7. Sensory nerves- nerves that conduct impulses into the brain or spinal cord.
8. Motor nerves- nerves that carry impulses to muscles or glands.
9. Mixed nerves- consists of most nerves. These include both sensory and motor nerve fibers.
10. Meninges protect the CNS (brain and spinal cord). Meninges have three layers, the dura mater, arachnoid mater, and the pia mater.
11. The peripheral nervous system (PNS) can be divided into the somatic nervous system and the autonomic nervous system.

Answer 2

The nervous system is the main control of the body.

Answer 3

If dogs are nervous, they will be laid back and stuff.