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nervous system
- -Regulates body structures and processes to maintain homeostasis despite fluctuations in the internal and external environment ex(constriction and dialation of blood vessels)
- -made up of the brain and spinal cord as well ad the nerves that emerge from them and connect them to the rest of the body
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Homeostasis
The tendency of the body to maintain a relatively constant internal environment
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Central nervous system (CNS)
- -Concists of the brain and spinal cord
- -Intergrates and processes information sent by nerves
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Peripheral nervous system
- -Nerves that carry sensory messages to the Central Nervous system (CNS)
- -Nerves that send information from the CNS to the muscles and glands
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Organization of the Human nervous system (chart)
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Stomatic nervous system
- - In vertebrates, division of the perpheral nervous system that controls VOLUNTARY movement of skeletal muscle
- -Conducts signals from the centralnervous system to the skeleral muscles and signals from the sensory receptors in the body to the CNS
-compare: automomic system
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Automomic Nervous System
-in vertebrates, the division of the periphreal nervous sytem that is under INVOLUNTARY control
-Regulates glandular secretions and function of smooth and cardicac muscle
Compare: Somatic system
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What 2 main types of cells make up the nervous system?
- 1. Neurons
- 2. Glial cells (cells that support the neurons)
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Sympatetic and parasympatetic nervous systems
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Neuron
- -Basic structural and functional units of the nervous system
- -Specialized to:
- ~respond to physical and chemical stimuli
- ~Conduct electrochemical signals
- ~Release chemicals that regulate body processes
- Bonus
- -Consists of a nucleus, cellbody, dendrites, axons, and a myethin sheath
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Glial
- -Out number neurons by about 10 to 1
- -Account or about half of the nervous systems volume
- -Nourish the neurons
- -remove wastes
- -Defend against infection
- -Provide a support framework for nerve tissue
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Nerves
- -Message pathway of the nervous system
- -Made up of many neurons grouped into bundles and surrounded by a protective connective tissue
- Bonus
- -Some nerves are sensory (receptors)
- -Some nerves are motor(muscles)
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What 3 types of neurons form the basic impulse- transmission pathway of the entire nervous system?
- 1. Senosry imput neurond
- 2. Internurons (Integration)
- 3. mortor output neurons
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Sensory input
- - Sensory neurons gather information from the sensory receptors (sences)
- - and transmit these impulses to the central nervous system (brain and spinal cord)
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Integration
- -Neurons found within the nervous system
- -Link between sensory and motor
- -Process and intergrate incoming info and relay outgoing motor info
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Motor output
- -Transmit information from the CNS to muscles, glands and other organs (effectors)
- - Impulses travel to the motor neuron via interneurons
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