SKELETAL MUSCLE FIBER PROTEINS

Question 1

TYPE OF PROTEIN

Answer 1

Contractile
Regulatory
Structural

Question 2

Proteins that generate force during muscle contractions

Answer 2

Contractile Proteins

Question 3

Contractile protein that makes up thick filament

Answer 3

Myosin

Question 4

Contractile protein that is the main component of thin filament
- Individual actin molecules join to form an actin filament that is twisted into a helix.

Answer 4

Actin

Question 5

Proteins that help switch muscles contraction process on and off

Answer 5

Regulatory Proteins

Question 6

Regulatory protein that is a component of thin filament; when calcium (Ca2+) bind to troponin

Answer 6

troponin

Question 7

Regulatory protein that is a component of thin filament when skeletal muscle relaxed covers myosin binding sites on action

Answer 7

Tropomyosin

Question 8

Proteins that keep thick and thin filaments of myofibrils in proper alignment

Answer 8

Structural Proteins

Question 9

Structural protein that connects Z disc to M line of sacromere help to stabilize thick filament position

Answer 9

Titin

Question 10

Structural protein of Z discs that attaches to actin molecules of thin filaments & to titin molecules

Answer 10

a-Actinin

Question 11

Structural protein that forms M line of sacromere

Answer 11

Myomesin

Question 12

Structural protein that wraps entire length of each thin filament

Answer 12

Nebulin

Question 13

Structural Protein that links thin filaments of sacromere to integral membrane proteins is sarcolemma

Answer 13

Dystrophin

Question 14

points toward the M line in the center of the
sarcomere.

Answer 14

Myosin tail