(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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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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current) at the end of the axon terminal (axon terminal- the swollen distal end of the motor neuron axon). When the action potential reaches the axon terminal the action potential causes the voltage- gated calcium ion channels to open allowing calcium to flow in from extracellular fluid. The presence of calcium in the axon terminal causes synaptic vesicles (synaptic vesicles- small membranous sacs that contain the neurotransmitter acetylcholine also known as ACH) to fuse with the axon terminals axonal membrane
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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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different functions like muscle control and triggers. Axon An Axon is a long‚ arm like structure that transmits information on to still other neurons. The axon is the elongated fiber that extends from the cell body to the terminal endings and transmits the neural signal. The larger the axon‚ the faster it transmits information. Myelin sheath Myelin sheath is an insulating envelope of myelin that surrounds the core of a nerve fiber or axon and that facilitates the transmission of nerve impulses
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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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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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The Major Issues- Chapter 1 Module 1.1 1. The Mind-Brain Relationship a. Biological Psychology is the study of physiological evolutionary and developmental mechanism of behavior and experience. b. At the microscopic level‚ we find two kinds of cells: the neurons and the glia i. Neurons send messages to each other and also to muscles and glands. They have changing sizes‚ shape and functions. ii. Glia- which are most of the time smaller than neurons have many
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Action Potential An action potential‚ also called a spike‚ nerve impulse‚ and discharge‚ is the rapid reversal of charge of the cell membrane. These changes in charge occur within milliseconds‚ meaning the action potential travels very quickly down the axon in order to convey information over long distances. This transfer of information occurs within six phases and requires the presence of multiple pumps and channels embedded in the membrane to control ion concentration. Phase 1: The Resting Phase The
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