Exercise 3: Neurophysiology of Nerve Impulses Worksheet Assignment Due: Week 4 Student instructions: Follow the step-by-step instructions for this exercise found in your text and record your answers in the spaces below. Submit this completed document by the assignment due date found in the Syllabus. Please make sure that your answers are typed in RED. Please type your Name and Student ID Number here: Charles Coon 4048223 Eliciting a Nerve Impulse Activity 1: Electrical Stimulation
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Exercise 3: Neurophysiology of Nerve Impulses Worksheet Eliciting a Nerve Impulse Activity 1: Electrical Stimulation 1. Do you see any kind of response on the oscilloscope screen? No there was no response‚ the line was flat 2. What was the threshold voltage‚ or the voltage at which you first saw an action potential? 3.0V 3. How does this tracing compare to the one that was generated at the threshold voltage? At 3.5V the high & low peaks were just slightly above and below respectively
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The Worksheet Questions Table 1. The effects of phentolamine and atropine on the contractile response to nerve stimulation (20 Hz) in the isolated rabbit ileum | |Contraction amplitude |Contraction amplitude with the |Effect of nerve stimulation on the contraction amplitude | | |pre-nerve stimulation |maximum response to nerve | | | |
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neurons Back ligand gates mechanical gates Front this conduction type is faster and more energy efficient and involves myelinated neurons Back saltatory Front this is the name for a bundle of axons in the PNS Back nerve Page 5
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through the microscope of the neuron‚ the ox spinal cord smear‚ and the teased myelinated nerve. Please describe what you observed on each slide. Questions A. What is the function of a neuron? To carry and transmit electrical impulses generated by both internal and external stimuli. B. What is the difference between a neuron and a nerve? Nerves are organizes bundles of nervous system cells. These bundles are assigned specific areas of
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Reflexes Activity 1 – Nerves Type the numbers‚ in the space provided‚ of the structures pointed out on the diagram of a cross section of a nerve in your lab book with the following terms: 6 axon 12 endoneurium 1 epineurium 2 fascicle 7 motor ending 10 myelin sheath 9 neurilemma 11 node of Ranvier 3 perineurium 5 peripheral nerve 8 Schwann cell 4 sensory receptors What is the difference between a nerve and a neuron? They are both completely different a nerve is a cord like organ
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reflex‚ a variant of Trigeminocardiac reflex (TCR) is also reported to cause Venticular bigeminy.[7‚8] Surya kumar et al reported in their case by an increase in the ICP caused due to Valsalva Manoeuvre triggered TCR which due to stimulation of trigeminal nucleus caused the ventricular bigeminy.[9] Any disturbance in the potassium balance causes cardiac arrhythmia.[10‚11] Prominent U waves along with ST segment and T wave depression is a significant sign of hypokalemia.[12] In a hypokalemic patient
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clumsiness E. Wrist flexion Choice “B” is the best answer. The nerve that was most likely injured in this patient is the
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isolated sciatic nerve from a cane toad‚ Bufo marinus. Compound action potentials are the total sum of action potentials from the multitude of neurons that compose a nerve (Stillman‚ 2005).
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(Generating) a Nerve Impulse 1. Why don’t the terms depolarization and action potential mean the same thing? Depolarization has to do with surfaces becoming more negative or positive and reaches a certain point called a threshold. When the threshold is reached‚ an action potential is initiated. 2. What was the threshold voltage in Activity 1? The threshold voltage in Activity 1 was 3.0. 3. What was the effect of increasing the voltage? How does this change correlate to changes in the nerve? There
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