blocks action potential production at the site of injection. How do you think Novocain works on the axon membrane‚ and how does it block the sensation of pain? Novocain serves to block receptors on nerve cells that sense pain. Therefore preventing neurotransmitter from binding to the receptors and stimulating sensory neurons to fire. More specifically Novocain blocks the sodium channel and prevents depolarization from occurring in the neurons of the site of injection. Because of this an action potential
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causes the membrane potential to change to a less negative value. How well did the results compare with your predictions? 3. Explain why a change in extracellular Na+ did not significantly alter the membrane potential in the resting neuron? 4. Discuss the relative permeability of the membrane to Na+ and K+ in a resting neuron. 5. Discuss how a change in Na+ or K+ conductance would affect the resting membrane potential. ACTIVITY #2 1. Sensory neurons have a resting potential based on the efflux
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observed an action potential was 3.0V 2. How does this tracing compare to the one that was generated at threshold voltage? The small increase in voltage causes a small increase in the height of the action potential peak. 3. What reasons can you give for your answer? Recruitment of the nerve’s neurons. Increasing the voltage will cause most of the neural fibers to experience depolarization. 4. At what voltage did you no longer observe an increase in the peak of the action potential trace? Maximum
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Excitation Contraction Coupling Process The sequence of events that converts action potentials in a muscle fiber to a contraction is know as excitation contraction coupling. In order for a skeletal muscle fiber to contract‚ it has to get a signal from the nervous system. The part of the nervous system that it gets a signal from is called a motor neuron. An electoral signal‚ called an action potential travels down the axon and to the axon terminal. At the end of the motor neuron are structures
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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 the tracing that occurred at 3.0V 4. What reason can you give for the
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Exercise 3: Neurophysiology of Nerve Impulses: Activity 7: The Action Potential: Conduction Velocity Lab Report Pre-lab Quiz Results You scored 100% by answering 5 out of 5 questions correctly. 1. An action potential can be propagated along an axon because there are __________ channels in the membrane. You correctly answered: d. voltage-gated 2. The units of conduction velocity are You correctly answered: d. meters/second. 3. Which of the following will affect axonal conduction velocity? You correctly
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1. A. Homeostasis is defined as a condition of equilibrium in the body internal environment. For example the internal organs‚ behaviors‚ body temperatures. In homeostasis it can be considered as dynamic as it is always changing. The liver‚ kidneys‚ autonomic nervous system and endocrine system‚ and hypothalamus help maintain homeostasis. For example‚ my brother has imbalance homeostasis due to having seizures. Because his brain is not functioning correctly‚ his homeostasis is not balance. B. Medial
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Part 1 of 17 - 1.67/ 5.0010004 Points Question 1 of 60 0.0/ 1.667 Points All of the following belong to feedback systems which control homeostasis EXCEPT A. All of the above are basic components of the feedback system. B. control center. C. receiver. D. receptor. E. effector. Answer Key: C Feedback: Please review chapter 1. Question 2 of 60 0.0/ 1.667 Points Group of related organs that have a common function is called a(n) A. organ.
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Impulses: Activity 9: The Action Potential: Putting It All Together Lab Report Pre-lab Quiz Results You scored 100% by answering 4 out of 4 questions correctly. 1. Sensory neurons respond to an appropriate sensory stimulus with a change in membrane potential that is You correctly answered: b. graded with the stimulus intensity. 2. If the depolarization that reaches the axon is large and suprathreshold‚ the result in the axon is You correctly answered: c. action potentials at higher frequency
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Neuroscience: Neurotransmitters (small molecule and neuroactive)‚ storage release removal and disease. 1. The brain is made up of neurons that process and transmit information by electrochemical signaling. Neurotransmitters are endogenous chemicals which relay‚ amplify‚ and modulate signals between a neuron and another cell. Chemical messengers must fulfill four criteria to be considered a transmitter. These four steps include the synthesis of a transmitter substance‚ the storage and release of
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