BIO 161- EXAM 4 DEHART PSU QUESTIONS AND
ANSWERS A+ GRADED
Skeletal Muscle Tissue
Voluntary, striated, multinucleate, attached to bone or fascia
Cardiac Muscle Tissue
Involuntary, striated, mononucleate, autorhythmic
Smooth Muscle Tissue
Involuntary, non-striated, mononucleate, found in GI tract
Excitability
Respond to chemicals released from. motor neurons
Conductivity
Ability to propagate electrical signals over the membrane
Contractility
Ability to shorten and generate force
Extensibility
Ability to be stretched without damaging the tissue
Elasticity
Ability to return to original shape after being stretched
Muscle
Formed by a group of fascicles
Fascicle
Formed by a group of muscle fibers
Muscle fibers
Formed by a group of myofibrils
Myofibrils
Contain bundles of protein filaments, organized into sarcomeres
Connective Tissue
Protects muscle cells, reduces friction, creates space of ECF
Epimysium
Covers entire muscle
Perimysium
Covers fascicles
Endomysium
Covers muscle fibers
Indirect Connection (Muscle to Bone)
Collagen fibers of epimysium form strong fibrous tendon that merges into the
periosteum. Most common connection
Direct (fleshy) Connection (Muscle to Bone)
Collagen fibers of epimysium are directly continuous with the periosteum
Muscle to Fascia Connection
Muscles insert to broad sheet of connective tissue
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