Over several weeks, we trained Lynn in the ins and outs of creating and editing videos in the screencasting software, Camtasia. What type of assay was used to measure plasma insulin and glucagon levels? Effect of Stimulation Frequency on Contraction 1. Click the Assignment Files tab to submit your assignment. At which stimulation voltage s did you see decrimental conduction of graded potential from axon hillock to axon? Both on campus and off campus online capability must be accommodated to the increase of people enrolled. Once the stimulation voltage rises above threshold, force generation increases as the stimulation voltage increases. Endomysium: Mostly reticulum fibers, penetrates interior of each fascicle and separates each muscle fiber individually.
Click the Assignment Files tab to submit your assignment. As a result the total force produced by the muscles increases. The motor unit was stimulated. Controlled Variables are the muscle fiber length, temperature, freq of stimulation. These things are the cause of the earth heating up, or global warming. Also, when a muscle fiber is relaxed, the Ca concentration in the sarcoplasm is very low. Also, when a muscle fiber is relaxed, the Ca concentration in the sarcoplasm is very low.
See Table 2: Effect of Temperature on Sucrase Activity See Graph, Effect of Temperature on Sucrase Activity 2. See Table 6: Stimulation Frequency and Contraction Force See Graph: Effect of Stimulation Frequency on Contraction Force 8. What was the optimal muscle length muscle length that generated the maximum force? The Sixth Edition of the Laboratory Manual for Anatomy and Physiology gives instructors the freedom and flexibility to customize their own laboratory courses. The membrane potential was 30. The lower the Ca concentration will result in lesser force production.
An increase in the Ca level in the sarcoplasm starts the sliding of thin filaments, but when the level of Ca in the sarcoplasm declines, sliding will stop. Task 1 Procedure 1 Convert decimal number 125 to binary. Discuss why maintaining plasma osmolality within normal limits is important. These questions reinforce key concepts prior to students proceeding onto pre-lab reporting. What was used to measure membrane potential? An Assignable Video Library Wiley worked closely with Jill to devise a video solution tailored specifically to her needs.
This minimal voltage is called a threshold stimulus. This material may be accessed at any point during the lab activity. Why were physical activity and caffeine and alcohol intake the controlled variables? My second prediction was urine osmolality would be lowest during normal hydration. See Table 5: Muscle Length and Contraction Force See Graph: Effect of Muscle Fiber Length on Contraction Force 4. Click the Assignment Files tab to submit your assignment. Which part of the neuron was stimulated? The maximum stimulation voltage used was 500 mV. In addition to his original textbook content, he also developed tutorial videos and Excel templates that needed to be made available as password-protected resources.
At what frequency of stimulation was the maximum force generated? This toxin blocks exocytosis of synaptic vesicles at the neuromuscular junction. Independent Variable is the frequency of stimulation. Get homework help and answers to your toughest questions in biology, chemistry, physics, math, calculus, engineering, accounting, English, writing help, business, humanities, and more. This will result in decreased water reabosorption, diluted urine, and concentrated blood plasma. Number of action potentials generated at different times between stimulations. This only happens at the threshold. Independent Variable: frequency of stimulation.
Controlled Variables Frequency of stimulation Type of neuron Experiment 2: Effect of Frequency of Stimulation on Action Potential Generation 1. An increase in the frequency results in an increase in force. Where was membrane potential measured? The urine osmolality is lowest when the body is dehydrated. Explain why this is important. When a skeletal muscle is repetitively stimulated, twitches can overlap each other and result in a stronger muscle contraction than a stand-alone twitch.
Explain how this prevents skeletal muscle contraction. What was used to measure membrane potential? Action potential is first generated in the dendrites of the neuron, or where the neuron receives the action potential of other neurons. Botulinum toxin is taken up by axon terminals and inhibits the ability of a motor neuron to stimulate a skeletal muscle motor unit to contract by preventing the release of acetylcholine from the axon terminal. Dependent Variable contraction force 2. Water consumption measured urine output, and a finger stick. However, this trend does not continue past the optimal amount of voltage that generates the maximum force. What was the resting membrane potential no stimulation recorded in Table 3? Effect of Stimulation Frequency on Contraction 2.
The department needed a way to deliver this content digitally, with assessments and lab reports that could be transmitted online as well and autograded wherever possible. What type of assay was used to measure plasma glucose and ketone levels? For each of the stimulation voltages, indicate whether it was sub-threshold, threshold, or suprathreshold. Effect of Stimulation Frequency on Contraction 2. This will cause reabsorption of water, giving the body more blood volume, and lower osmolality. In Experiment 1, discuss why the amplitude of the action potential did not increase as stimulation voltage increased above threshold. Submit completed worksheets to the faculty member. Compare the maximum force generated when stimulation frequency was increased with the maximum force generated at threshold stimulus.
Maximum force occurs when all the motor units of a muscle are stimulated and all muscle fibers are contracting. Therefore Ach responsible for signaling muscles to contract is not released, and muscle contraction does not occur. What are the technical goals? Controlled Variables temperature; frequency of stimulation; stimulation voltage Effect of Stimulation Frequency on Contraction 1. What was used to measure membrane potential? What was used to measure membrane potential? Which part of the neuron was stimulated? The more stimuli per second, the greater the force generated by the muscle due to a sustained contraction. By increasing the voltage above the threshold stimulus, also the force generated from the muscle increases.