Structure and Function of Organisms
Bio 206L

Lab 14: Nerve and muscle

Questions for Frog Nerve/Muscle Lab


1.  The nerve you will dissect (together with the muscle) in this week's lab is named the ___________ nerve.

2.  The muscle to used in the experiment this week is called the ________________.

3 & 4.  To measure muscle force, the muscle is attached to a device called a ________ __________ (2 words) that reports a voltage proportional to the force to the A/D converter.

5.  The tension response to a single stimulus of the nerve is known as a _______________.

6 & 7.  A single motor neuron and all the muscle fibers that neuron innervates is known as a ________ _________. 

8.  If the nerve is stimulated repetitively, the maximum force produced is  __________ (choose more, less, or the same as) the tension generated by a single stimulus.

9 & 10.  When examined under the microscope, the muscle contains alternating light and dark bands.  The dark band is known as the _____ band.  The light band is known as the _____ band.

11.  In the middle of the light band is a line known as the _____ line.

12.  The repeating unit from one line in one light band to the next line in the next light band is known as the ______________.

13, 14& 15.  The muscle contracts in response to stimulation of the nerve because the nerve terminals liberate a neurotransmitter known as _____________, that binds to receptors in the muscle membrane, depolarizes the muscle membrane past threshold, causing it to generate an __________ ___________ (two words). 

16 & 17.  The major contractile proteins of muscle are known as ________ and ________.

18.  A protein that negatively regulates muscle contraction by preventing interaction between the major contractile proteins is ________________.

19 & 20.  The negative regulation of filament sliding is owed to the release of ________ ions from the _____________ reticulum.

21 & 22.  Muscle relaxation occurs when the ______ ions are pumped back into the __________ reticulum.

23 & 24.  The amount of tension generated by a muscle can be varied by the nervous system by determining the number of simultaneously active ________ units and the _________ at which each of these units is firing.

25.  The maximum response of a muscle to repetitive stimulation is known as a ________.  


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