Question

Using Figure 9.5 in your text, review muscle fiber structure Identify the labelled structures 1. 2. 3. 4. 5. 6.

2. Using the numbers from above identify the structure. Numbers can be used more than once _____ The structure that stores Ca+ _____ The structure that allows an action potential to move deep into the muscle fiber _____ The structure that has calcium release channels embedded in it _____ The muscle cell membrane _____  In-folds of the muscle cell membrane _____ Structures that contain sarcomeres _____ Two terminal cisterns and a T-tubule _____ This structure contains voltage-sensitive proteins

Answer 1

A. cisternae of sarcoplasmic reticulum stores Ca++ ions.

B. T-tubule is the structure that allows action potential ti move deep into the muscle fiber.

C. Sarcoplasmic reticulum has the calcium release channels embedede in it.

D. Sarcolemma is the muscle cell membrane.

E. T- tubule are infolds of muscle cell membrane.

F. Myofibril are the structured containing sarcomeres.

G. Triad has Two terminal cisternae and a T-tubule

H.sarcoplasmic reticulum this structure contains voltage sensitive proteins.