Ch2 part1

Ch2 part1 - CELLS OF THE NERVOUS SYSTEM Ch 2 The Nervous...

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Unformatted text preview: CELLS OF THE NERVOUS SYSTEM Ch 2 The Nervous System (NS) wo parts . Central Nervous System (CNS) • Comprised of the brain and spinal cord • Encased within the skull and spinal column 2. Peripheral Nervous System (PNS) • Comprised of nerve tissue located outside the brain and spinal cord Three General Types of Neurons in the NS • Sensory Neuron: detects changes in the external or internal environment and sends these changes to the CNS • Motor Neuron: Cell body located in the CNS and output in the PNS controls the contraction of a muscle or the secretion of a gland • Interneuron: located entirely within the CNS Basic Internal Structure of Neurons Nucleus : contains chromosomes Nucleolus : found within the nucleus and makes ribosomes Mitochondria : source of energy (ATP) Endoplasmic Reticulum: helps manufacture & store proteins for transport. Ribosomes dock here. Golgi Apparatus : More complex proteins are processed before excretion Organelles: contain double-layer of lipid (fat) surrounding the structure Lysosomes : degrades products not needed by cell Fig. 2.5 Other Important Cell Components (not organelles) 1. chromosomes & deoxyribonucleic acid (DNA) 2. messenger ribonucleic acid (mRNA) 3. ribosomes 5. cytoplasm 4. enzymes 6. adenosine triphosphate (ATP) Fig. 2.5 Cytoskeleton...
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This note was uploaded on 03/24/2009 for the course PGS 24674 taught by Professor Biswas during the Spring '09 term at ASU.

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Ch2 part1 - CELLS OF THE NERVOUS SYSTEM Ch 2 The Nervous...

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