Powerphys. NRSG 202 Lab: Powerphys 8 and 9 Flashcards 2022-10-20
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powerphys 1&2 Flashcards
Did the inspiratory capacity increase, decrease, or not change with exercise? Students are asked a series of short answer questions about their experiments, to write a conclusion, and to answer application questions. Change in sEMG frequency of spikes. This causes hyperpolarization, and causes a decrease in action potentials because increased amounts of stimulus are required to reach threshold. The correct answer must be selected prior to progressing through the exercise. Available in versions of eGrade Plus. The nerve that innervates the biceps brachii muscle is the musculocutaneous nerve.
Glycogenolysis increases blood plasma glucose levels by breaking down glycogen and releasing glucose molecules. The finger pulse transducer generates a force peak amplitude that displays the extent to which a muscular twitch responds to a nerve stimulus, and nerve frequency. Buildup of ketones causes ketoacidosis. Independent Variable level of physical activity resting or exercise 3. We predict this speed of propagation to be between 0 and 80 meters per second.
Breakdown of fatty acids results in production of ketones. The heart of elite athetes is larger and contracts more forcibly than the heart of an average individual. The slow oxidative motor units are recruited first, with stronger motor units, that are less fatigue resistant, added if more force is needed in response to a greater muscle load. ECF potassium levels affect resting membrane potential. The change was 18 per 0. The extra volume of blood returning to the right ventricle would increase EDV. During exercise SV will increase 3.
What does the acronym sEMG stand for? Estimate the length of the refractory period for the pyramidal neuron. Decreased insulin secretion Type I diabetes or decreased sensitivity of cells to insulin Type II diabetes decreases transport of glucose into cells. Membrane potential between the axon hillock and axon did not change because only threshold stimulus is able to depolarize the membrane and allow Na+ ions to enter the neuron and cause an action potential. This is a dummy description. The lab report may be printed and saved as a PDF file. Lipolysis provides fatty acids that can be used to make ATP.
At which stimulation voltage s did you see decrimental conduction of graded potential from axon hillock to axon? Eating improperly prepared puffer fish sushi can be fatal because of interference with action potential generation. Which would be a better predictor of increase in force of contraction, change in sEMG amplitude of spikes or change in sEMG frequency of spikes? RESULTS See Table 3: Muscle Tone Resting and Isotonic Contractions See Graph 1: sEMG Amplitudes and Frequencies at Rest and During Isotonic Contractions 1. Location Stimulation Voltage 0 V no stimulation 2 V 4 V 6 V 8 V Axon hillock -68 -64 -56 30 31 Axon -68 -73 -65 30 30. Did the minute ventilation increase, decrease, or not change with exercise? Different motor units in a muscle are used in a certain order based on the physical activity that needs to be performed. During arm extension, what type of contraction would the triceps brachii be exhibiting: concentric isotonic contraction, eccentric isotonic contraction, isometric contraction concentric isotonic contraction 7. Objectives and Review Material. Yes, but at a very low rate of 0.
Based on changes in amplitude and frequency of sEMG, did motor unit activation increase, decrease, or stay the same with increasing muscle load? Explain how muscles become flaccid. Inability to transport glucose into cells prevents glucose levels from returning to normal after a meal. Motor unit decreased in regards to the amplitude it went from 0. Controlled Variables Effect of Muscle Length on Contraction 1. As muscle load is increased, which muscle fiber type is recruited first, second, and last? Discuss the importance of muscle tone.
Dependent Variable EDV, ESV, and cardiac cycle length 2. Did motor unit stimulation, reflected in amplitude and number of spikes per 0. During exercise: TLC will not change. Tables and Graphs are submitted to the laboratory report. To assure that all breathing would be done through the mouth Results Table 2: Average Breathing Rates and Subject1 Subject2 Subject3 Averages Breathing Rate 11.
In Experiment 2, explain why the number of action potentials generated varied with increased stimulation frequency. Materials and Methods 1. The stronger contraction would match blood volume ejected by left ventricle. Action potential occurred at simulation voltages 6V and 8V. Muscle tone is important because it allows us to maintain our body posture.
As stimulus strength is being increased, progressively more muscle fibers reach their thresholds and contract. When we see the slightest evidence of force production on a tracing, the stimulus applied must have reached e. Explain what effect damage to this muscle would have on contractile force and recruitment of motor units in the biceps brachii muscle. Therefore, the purpose of this lab was to observe how the motor unit recruitment in contractile… Muscle Lab A motor unit consists of a a and all the b it innervates. Users can perform physiological experiments using simulated equipment and real data. Director of Advanced Energy at Motorola Solutions, Inc.
Discuss how increasing the number of motor units stimulated affects force. Once the blood sugar level is stabilized, negative feedback inhibits the pancreas from producing insulin, thus maintaining homeostasis. Independent Variable muscle load. Increasing HR during exercise and increasing force of contraction results in an even greater CO. Explain why the temperature of the water bath was 35C 95 F. A gradual increase can be seen in the amplitude of sEMG spikes with increasing muscle load. Muscle contractions are a direct byproduct of motor unit recruitment, and for this lab we can examine these effects with aid of a finger pulse transducer and a bar stimulus electrode.
