Question

What elastic protein anchors myosin to Z-discs in skeletal muscles? This elastic protein is critical to restore the full length of the sarcomere following contraction.

A)actin filament

B)thick filament

C)titin filament

D)thin filament

Answer 1

C.) Titin Filaments

• There are two types of bands : thick bands and thin bands
• Thick bands are made up of multiple molecules of a proteins called myosin.
• Thin bands are made up of multpile molecules of a protein called actin.
• The thin actin bands are attached to Z - line or Z - disc of an elastic protein called titin.
• Titin proteins also extends into the myofibril anchoring the other bands in position.
• From each Z - line to the next is a unit called Sarcomere.
• Sarcomere is the smallest contractile unit in the myofibril
• Sarcomere contracts because the Z - line moves close together.
• As the sarcomere contract the myofibrils contract.