Identify three microscopic components of muscle cells notfound in other types of cells.

In myogenesis, the assembling sarcomeres are integrated with the extracellular matrix (composed of collagen and laminin), across the plasma membrane (sarcolamina) by the following     Integrin-vinculin complex     Dystrophin glyco protein complex     by actinin that bind collagen and filamin that bind actin filaments     a and b     a and c     b and c     none of these

2 a) What does calcium do in a skeletal muscle cell and where in the cell does it come from?                   b) John’s Stetson (his hat) blew off his head in a strong wind and he sprinted down the hill to retrieve it.  Where did his ATP come from in the first 6 seconds and the next 8 seconds of his run?

Cofilin preferentially binds to older actin filamentsand promotes their disassembly. How does cofilin distin-guish old filaments from new ones?

How is the striped patternof the striated muscle cellsformed?

How would you expect muscle cells to differ from most other cells of the body? a) Muscle cells would have large numbers of mitochondria compared to other cells b) Muscles would have more golgi apparatus than other cells of the body c) Muscle cells would have more centrosomes than cells of the body d) Muscle cells would have more rough endoplasmic reticulum than other cells of the body

Which of the following labeled zones in the electron micrograph of the sarcomere shortens during contraction? OA) B) -E C) 00) D E) -C -8

Which part of a skeletal muscle does shorten during muscular contraction? A) Thick filaments B) Thin filaments C) Z disks D) Sarcomeres

Transmission of electrical signals in nerve and muscle cell is mediated by opening and closing of: 1) ion channels in the nuclear envelope  2) ion channels in the plasma membrane  3) the electron transport chain 4) the sodium potassium ATPase in the plasma membrane

what critical cellular/molecular events allow a musckle fiber to relax after contraction?