The Sarcomere

Question 1

Sarcolemma

Answer 1

plasma membrane of the cell

Question 2

Sarcoplasmic Reticulum

Answer 2

-endoplasmic reticulum of the muscle cell
-stores calcium needs to trigger actin filament

Question 3

Actin

Answer 3

-thin protein filament twisted in a double helix
-actin myofibrils have binding sites that are covered by troponin and tropomyosin
-actin anchored to Z-line of sarcomere

Question 4

Myosin

Answer 4

-thick protein filament companion to actin
-thicker heads that stick out
-heads provide binding sites for ATP
-not anchored to Z-line