Muscles Study Guide

The functions of skeletal muscles include:

• Movement and posture

• Digestion and absorption

• Hormone secretion

• Blood filtration

Myofibrils are composed of:

• Actin and myosin filaments

• Collagen fibers

• Elastin fibers

• Keratin filaments

Nerves and blood vessels that service the muscle fibers are located in the connective tissues of the __________________________.

• PERIMYOSIN

• EPIMYSIUM

• ENDOMYSIUM

• FASCIA

The delicate connective tissue that surrounds the skeletal muscles fibers and ties adjacent muscle fibers together is the __________________________.

• ENDOMYOSIN

• PERIMYSIUM

• EPIMYSIUM

• FASCIA

Where are neurotransmitters stored?

• In the synaptic vesicles

• In the cell nucleus

• In the mitochondria

• In the ribosomes

The command to contract is distributed throughout the muscle fiber by the:

• sarcoplasmic reticulum

• T-tubules

• mitochondria

• nucleus

The cytoplasm of a skeletal muscle fiber is called the:

• Sarcoplasm

• Myoplasm

• Endoplasm

• Cytosol

At rest, the tropomyosin molecule is held in place by

• actin

• myosin

• troponin

• calcium ions

When calcium ion binds to troponin, what happens next?

In response to action potentials arriving from the transverse tubules, the sarcoplasmic reticulum releases: