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The Williams family lives in an inner-city community that is poor, cut off from the larger society, and without good schools or good-paying jobs. This family is experiencing what sociologists call __________.

Total force is equal to the sum of the [a] and [b] forces.

Activity 4:  Which of the following describes the relationship between stimulus frequency and muscle tension?

Distinguish between multiple motor unit summation and wave summation with respect to the force of contraction each is capable of developing.  (HINT:  Refer to data above-% increase with tetanus).  Note that in this table the single twitch represents multiple motor unit summation and tetanus represents wave summation. Contractions as a result of [x] are more than 200% greater than contractions resulting from [y].  

Activity 6:  Why does the active force of skeletal muscle change with the muscle’s resting length?

ACTIVITY 5:  Where is ATP required in contraction (shortening of the myofilaments)? (HINT: Refer to information in Vander Textbook 13th ed:  Section 9.2)

Activity 5:  What might be occurring on a molecular level during the rest periods?

What was the % increase in the force of contraction at the maximal tetanic contraction over the single twitch?  [x] %. Round to the nearest whole number and enter the number only in the answer box.   Use the formula below and the values from the previous question. % Increase with tetanus  = {[(Tetananized contraction force) – (Single Twitch contraction force)] / (Single Twitch contraction force)} Multiply result by 100 to get percent.  

ACTIVITY 3:  [x] is the strength of the stimulus measured in volts while [z] is the number of  times a stimulus is applied per unit of time (second)

Which of the following distinguishes a state of unfused tetanus from a state of complete (fused) tetanus?