Muscle Contraction In an experiment, the strength of a neural stimulus and the resulting muscle contraction are compared. A single motor neuron that synapses with one muscle fiber is observed in this experiment. One end of the muscle fiber is attached to a mass. The following data was obtained from the experiment. *attached document is chart with data 1. Does the data in the table provide sufficient evidence of the value for the threshold potential? Why or why not 2.a) A student remarked that at 180 mV of stimulus, it is expected that 100 g mass is lifted by the muscle fiber. b)Do you agree or disagree? Why or why not? 3.Identify the manipulated, responding and controlled variables in the experiment described above a) strength of stimulus ________ (manipulated, responding, or controlled) b) number of mucsle fibre stimulated _____ (maniuplated, repsonding, or controlled) c) mass lifted by muscle contraction ______ (manipulated, responding or controlled)
Muscle Contraction
In an experiment, the strength of a neural stimulus and the resulting muscle contraction are compared. A single motor neuron that synapses with one muscle fiber is observed in this experiment. One end of the muscle fiber is attached to a mass. The following data was obtained from the experiment.
*attached document is chart with data
1. Does the data in the table provide sufficient evidence of the value for the threshold potential? Why or why not
2.a) A student remarked that at 180 mV of stimulus, it is expected that 100 g mass is lifted by the muscle fiber.
b)Do you agree or disagree? Why or why not?
3.Identify the manipulated, responding and controlled variables in the experiment described above
a) strength of stimulus ________ (manipulated, responding, or controlled)
b) number of mucsle fibre stimulated _____ (maniuplated, repsonding, or controlled)
c) mass lifted by muscle contraction ______ (manipulated, responding or controlled)
4. How would you modify this experiment so that the mass lifted by the muscle contraction continues to increase for every trial?
5. A pin can be pressed against the skin lightly and elicit no response from the pain receptor. However, if the pin is jabbed into the finger, the pain receptor may be stimulated and the finger would quickly be withdrawn through a reflex arc.
Use what you know about threshold potential and the all-or-none principle to explain different levels of sensation (light touch or pain
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