are the two types of fast axonal transport? 5. What are the two types of neuroglia in PNS? 7. What do brain tumors arise from? 8. What do schawnn cells do in PNS? 9. What does the neuroglia or glial cells do? 10. What guides microtubules along axon? 11. What is anaxonic neuron? 12. What is anterograde transport? 13. What is astrocytes? 14. What is axonal transport or axoplasmic flow? 1. What are schwann cells? envelope nerve fibers in PNS. produce a myelin sheath multipolar‚ bipolar
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extracellular K+ 3. Which of the following has the most negative voltage? a. Between the outside of the axon and outside the cell body with control K+ ECF b. Between the outside of the axon and outside the cell body with High K+ ECF c. Between the inside of the axon and the outside of the axon with control K+ ECF d. Between the inside of the axon and the outside of the axon with High K+ ECF Activity 2 Pre-Lab Quiz 1 = c; 2= e; 3 = c; 4 = c Stop& Think Questions The adequate
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which only one protoplasmic process (neurite) extends from the cell body. Most neurons are multipolar‚ generating several dendrites and an axon: unipolar neurons are exceptions to this rule. These would be primary sensory neurons such as the ones found in the dorsal root ganglion. A multipolar neuron is a type of neuron that possesses a single (usually long) axon and many dendrites‚ allowing for the integration of a great deal of information from other neurons. These dendritic branches can also emerge
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a projection called an axon‚ which conduct the nerve signal. At the other end of the axon‚ the axon terminals transmit the electro-chemical signal across a synapse (the gap between the axon terminal and the receiving cell). The word "neuron" was coined by the German scientist Heinrich Wilhelm Gottfried von Waldeyer-Hartz in 1891 (he also coined the term "chromosome"). The axon‚ a long extension of a nerve cell‚ and take information away from the cell body. Bundles of axons are known as nerves or
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efficiently because -> • structure –long thin fibers that extend outer ward of cell body; intermixing allows neurons to be close to many other neurons. 2 types of fibers – Axons: fibers that carry signals away from the cell body‚ out to where communicate occur with other neurons. Dendrites: fibers that receive signals from the axons of other neurons and carry them down the cell body. Synapse: gap between neurons where they communicate • Nerve cell membrane is semipermeable (allows some things to
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chapter 2 chapter outline module 5 Neurons: The Basic Elements of Behavior The Structure of the Neuron How Neurons Fire Where Neurons Connect to One Another: Bridging the Gap Neurotransmitters: Multitalented Chemical Couriers module 6 module 7 The Brain The Nervous System and the Endocrine System: Communicating within the Body The Nervous System The Endocrine System: Of Chemicals and Glands Studying the Brain’s Structure and Functions: Spying on the Brain The Central Core:
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(voltage)‚ type of neuron 1. Which part of the neuron was stimulated? Axon 2. Where was membrane potential measured? Axon Hillock 3. What was used to measure membrane potential? stimulus strength (voltage) Results Table 3: Membrane Potentials at Different Stimulation Voltages‚ by Location. a. Values of maximal depolarization of membrane potential (mV) at different stimulation voltages‚ by location. Location Axon hillock Axon 0 V (no stimulation ) -68.6 -68.5 2V -63.6 -73 Stimulation
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one hundred and fifty and two hundred (milligram) percent. In this experiment we reached four hundred and fifty percent and a decrease in axon numbers of the optic nerve. The results do not match previous studies because of the different amount of alcohols. It is discovered that in normal development forty percent of retinal ganglion cells are lost. Axons lost between nine and fifteen weeks were due to atrophy not hypoplasia. Atrophy is when the cells are continuously lost by natural cause and
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and their associated 1a axons. These receptors make up the somatic sensory system that is focus on body sense or proprioception. The muscle spindle consists of several types of speacialized skeletal muscle fibers that are contained within a fibrous capsule. In the middle region of this fibrous capsule group 1a axons are wrapped around the muscle fibre on the spindle. Group 1a axons are the fastest and largest of the group 1 axons‚ which are also the thickest myelinated axons in the body. When a
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Thursday‚ January 30‚ 2014 Nervous Tissue ! Anatomy & Physiology - Overall Purpose of the Nervous System ! • To keep controlled conditions within limits that maintain life health and homeostasis ! - Regulates body activities by responding via nerve impulses‚ works with the endocrine system which responds by releasing hormones ! • Responsible for our behavior‚ memories‚ and movements ! • Neurology : branch of medicine that deals with normal functioning and disorders of the nervous system
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