What is the key variable in an isometric contraction of a skeletal muscle? - The length-tension
relationship.
Based on the unique arrangement of myosin and actin in skeletal muscle sarcomeres, explain why active
force varies with changes in the muscle's resting length. - When the skeletal muscle...
PhysioEx Exercise 2 Activity 6
What is the key variable in an isometric contraction of a skeletal muscle? - The length-tension
relationship.
Based on the unique arrangement of myosin and actin in skeletal muscle sarcomeres, explain why active
force varies with changes in the muscle's resting length. - When the skeletal muscles resting
length increases, there is more time for myosin bridges to return to their starting position.
Note the dip in total force at a muscle length of 90 mm as compared to the total force at a muscle length
of 80 and 100 mm. Why does this occur? - At this muscle length, active force has decreased in
value and passive force has not yet increased to a significant value.
During an isometric contraction... - The skeletal muscle is generating force, but it remains at a
fixed length.
The force that results from muscles being stretched is... - Passive force
Active force... - Is determined by the amount of myosin bound to actin.
When you generate the isometric length-tension curve, which of the following forces will not be
indicated on your screen? - Tetanic force
Passive force in skeletal muscle is largely caused by... - The protein titin
As the resting length of the muscle is changed, what will happen to the amount of total force the muscle
generates during the stimulated twitch? - An increase in muscle length will increase total force.
When a skeletal muscle is stimulated and generates force but remains at a fixed length... - The
muscle is contracting isometrically.
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