9. Muscle Tissue

During a muscle contraction, the ___________ pulls on the ___________, shortening the muscle.

During a muscle contraction, what gets shorter?

Myosin storage myopathy is a rare congenital condition where some of the myosin folds incorrectly in certain skeletal muscles creating clumps. Individuals with this condition exhibit muscle weakness and may be delayed in learning to walk as infants. What changes would you expect to see if you were to examine the sarcomere of an individual with this condition?

The contractile proteins of the sarcomere include which of the following?

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

Muscle fibers generate more tension if the starting length of their sarcomeres is very short.

What is the calcium-binding protein in smooth muscle tissue?

Compare these images of a relaxed skeletal muscle fiber and a fully contracted muscle fiber. Which would you see only in the relaxed fiber?

a. Z discs

b. Sarcomeres

c. I bands

d. A bands

e. H zones