Topic 8-9 Part 1 Muscular System

Myofilaments are made up of

• actin and myosin
• actin and tropomyosin
• actin and troponin
• actin and titin

The layers of skeletal muscle are ordered from largest to smallest as follows:

• perimysium, epimysium, endomysium
• endomysium, perimysium, epimysium
• endomysium, epimysium, perimysium
• epimysium, perimysium, endomysium

In skeletal muscle, the majority of Ca2+ comes from:

• the extracellular space

• endoplasmic reticulum

• cytoplasm
• sarcoplasmic reticulum

The T-tubule in skeletal muscle:

• A deep invagination of the sarcolemma
• A network of protein filaments
• A structure that stores calcium ions
• A shallow invagination of the sarcolemma

Terminal Cisternae in skeletal muscle:

• Production of ATP
• Storage of calcium ions
• Transport of oxygen
• Release and reuptake of calcium ions

In skeletal muscle, the sarcomere is:

• The outer covering of skeletal muscle
• The energy storage unit in skeletal muscle
• The basic unit of contraction in skeletal muscle
• The site of protein synthesis in skeletal muscle

In skeletal muscle, the I band "moves." True or false?

• True
• False

In skeletal muscle, the A band "moves." True or false?

• True
• False

In skeletal muscle, ___ attaches to the Z line

• actin
• troponin
• tropomyosin
• myosin

In skeletal muscle, the A band is made up:

• intermediate filaments composed of desmin protein
• elastic filaments composed of titin protein
• thin filaments composed of actin protein
• thick filaments composed of myosin protein