A) A motor neuron has just fired an action potential. How does this lead to skeletal muscle contraction? Outline or LIST all of the steps involved in skeletal muscle contraction following activation of a motor neuron.   (Be sure to include enough in your answer such that the muscle has actually gotten shorter).  You do not need to include all of the steps of the cross-bridge cycle in your answer, just get the muscle shorter.  (10 pts)B) Assume that the motor neuron then ceases to fire.  State 3 ways (other than motor neuron no longer firing) that ensure that the signal to the muscle cell is rapidly turned off/stopped.  (3 pts) C) If a person is suffering from Myasthenia gravis, describe how or if the above processes is impacted, being as precise and specific as possible (3 pts) 

You have isolated and identified a potentially novel toxin from a sea snail.  Your data suggest that the toxin may disrupt the interaction between the voltage sensitive t-tubule protein and the sarcoplasmic reticulum channel.  You think that the toxin prevents the SR protein from closing, once opened.   What data might you have seen from your muscle preparation that supports this hypothesis?

Which pathology below correctly matches this description-  Pain in joint comes on suddenly and is very intense.  Typically involves one small joint, in the lower body.  More common in males than females.  Blood work shows elevated uric acid (urate).  

The bacterium that causes tetanus produces a toxin that affects the central nervous system and skeletal muscles producing powerful tetanic contractions of the skeletal muscles.  The toxin probably acts by

The capillary blood collection method may be used

A fascicle is a

You should avoid a capillary puncture if the patient

You must draw a protime specimen from a patient with IVs in both arms. Which of the following is the best thing to do?

Look at the two pictures below.  Select the picture (A or B)  which indicates the correct position for capillary puncture.

Creatine is