Chapter 10-12: Nervous System & Special Senses 1. Masses of myelinated nerve fibers appear a. white. b. gray. c. brown. d. transparent. Answer: A 2. Which of the following lists the parts of a reflex arc in the correct sequence? a. receptor‚ sensory neuron‚ motor neuron‚ interneuron‚ effector b. effector‚ receptor‚ sensory neuron‚ motor neuron‚ interneuron c. effector‚ sensory neuron‚ receptor‚ interneuron‚ motor neuron d. receptor‚ sensory neuron‚ interneuron‚ motor neuron‚ effector
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of the following terms: axons‚ dendrites‚ neurons‚ terminal buttons‚ soma‚ synapse‚ receptor sites‚ neurotransmitter FCA 3: Student’s answers to neurotransmitter scenario questions display evidence of an understanding of the effects of various neurotransmitters by providing a logical choice(s) and appropriate evidence to support that choice. Question: Explain the process of information exchange that occurs in the brain. Be sure to include information on axons‚ dendrites‚ neurons‚ terminal
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responsible for different tasks in the human body.” (K Cherry) Each neuron is a cell that uses biochemical reactions to receive‚ process‚ and transmit information. Neurons communicate by firing‚ or transmitting an electrical impulse along the axon. Sometimes they do not fire. There is no middle ground with neurons‚ either they fire or they do not. A neuron fires when a message arrives at the neutron‚ from then on there is an electrical charge that sends positively charged ions sometimes as high
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located primarily on the ___ ___and ___‚ the receptive and integrative regions of the neuron. Axon hillock‚ action potential The area where the axon emerges from the soma (cell body) is called the ___ ___. This is also where the outgoing signal‚ called a/an ___ ___ is generated. Collaterals‚ terminals An axon can branch‚ forming many axon ___. At the end‚ axons branch to form many axon ___. Schwann cells What support cell forms the myelin sheath? Integral proteins What structures
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The nervous system is one of the most important systems in the body. The nervous system helps to keep the human body in balance. There are several important parts of the nervous system; the brain‚ spinal cord‚ and nerves. Each part of the nervous system has different jobs. There are two main parts of the nervous system peripheral and central. The peripheral nervous system is a collection of peripheral nerves‚ ganglia and specialized sensory structures that‚ as a unit‚ carries sensory and motor information
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can be thought of as an “all-or-nothing” event and occur as a large-scale depolarization when sodium and other positive ions rapidly enter the neuron through membrane channel proteins. Once initiated‚ action potentials travel down the length of the axon and when it reaches the end a neurotransmitter is released into the synapse. Neurotransmitters work differently and some can act to inhibit the neurons while others activate them. After the action potential is complete‚ the neuron must repolarize and
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complex‚ non-linear‚ and parallel computer. A neuron consists of the cell body‚ the dendrites‚ and the axon. The body of the cell contains the nucleus of the neuron. Each neuron has a hair-like structure of dendrites around it. They branch out into a tree-like form around the cell body. The dendrites are the principal receptors of the neuron and serve to connect its incoming signals. The axon is the outgoing connection for signals emitted by the neuron. It is a long cylindrical connection that
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Chapter 12: Nervous Tissue - The nervous system includes all nervous tissue in the body -Neural tissue contains two types of cells: 1) neurons (10% of all neurons‚ conduct nerve impulses) 2) neuroglia (support neurons) -We have 100 billion neurons -Organs of the nervous system: brain‚ spinal cord‚ sensory receptors of sense organs (eyes‚ ears‚ etc.)‚ and nerves (connects the nervous system with other systems‚ bundle of neurons that relay information) -Functions of the nervous system: 1) sensory
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While repair of the central nervous system has long been considered impossible have just developed some strategy in the past two years that could promote neuronal regeneration after injury 1. Regeneration of the corticospinal system- Restoring these axons is an essential step that in one day enabling patients to regain voluntary movement after spinal cord injury. 2. In the event of spinal injury or lesion‚ astrocytes proteins isolate the damaged neuron to prevent interference with the operation of
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contagious. Neuromuscular junction Neuron and muscle are not connected to each other. There is a small gap between them. This is called neuromuscular junction. Neuron (from the brain or spinal cord) will passed action potential through axon of motor neuron to an axon terminal. Sodium ion (Na+) and calcium ion (K+) are higher concentration outside than from the inside of the muscle and neuron. Na+ and K+ want to go inside but blocked by these channels (voltage gated calcium channels and ligand gated
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