BIO 115 Exam 3 Guide with complete
solutions
Properties of muscle tissue - correct answer ✔✔excitability, contractility, extensibility, elasticity
Contractility - correct answer ✔✔ability of a muscle to shorten with force
Excitability - correct answer ✔✔capacity of muscle to respond to a stimulus
Extensibility - correct answer ✔✔muscle can be stretched to its normal resting length and beyond to a
limited degree
Elasticity - correct answer ✔✔ability of muscle to recoil to original resting length after stretched
Sarcolemma - correct answer ✔✔plasma membrane of a muscle fiber
Sarcoplasm - correct answer ✔✔cytoplasm of a muscle cell
sarcoplasmic reticulum - correct answer ✔✔The smooth ER of a muscle cell
Fascicles - correct answer ✔✔bundles of muscle fibers
Myofibrils - correct answer ✔✔bundles of myofilaments that run the length of a fiber
Myofilaments - correct answer ✔✔are proteins actin and myosin that are arranged in a repeating unit
sarcomeres - correct answer ✔✔the repeating units of actin and myosin found along a myofibril
, origin - correct answer ✔✔attachment of a muscle to the less movable part of the bone and does not
move during contraction and is on the proximal end
Insertion - correct answer ✔✔attachment to the muscle of the more movable part of the bone and
moves toward the origin during contraction
Unipennate - correct answer ✔✔-one side of a feather
-semimembranosus or extensor digitorium
Bipennate - correct answer ✔✔-two sided feather
- gastronemius or rectus femoris
Multipennate - correct answer ✔✔-many headed two sided feather
- deltoid
pennate muscles - correct answer ✔✔There is an oblique fiber pattern in which fibers do not pull in the
same direction as the line of muscle pull. There is a shorter fiber length but usually a thicker cross-
sectional area
Fusiform - correct answer ✔✔muscle fibers run in line of pull there is a longer fiber length associated
with a fusiform structure, but often not very thick cross-section
thick filaments - correct answer ✔✔composed of myosin
thin filaments - correct answer ✔✔composed of actin
I band - correct answer ✔✔· the area composed of the dark Z-line and the light area on either side of it
which are the thin filaments
A-band - correct answer ✔✔· term for the darker area from one end to the thick filaments to the other,
including the area where the thin filaments overlap the thick filaments
solutions
Properties of muscle tissue - correct answer ✔✔excitability, contractility, extensibility, elasticity
Contractility - correct answer ✔✔ability of a muscle to shorten with force
Excitability - correct answer ✔✔capacity of muscle to respond to a stimulus
Extensibility - correct answer ✔✔muscle can be stretched to its normal resting length and beyond to a
limited degree
Elasticity - correct answer ✔✔ability of muscle to recoil to original resting length after stretched
Sarcolemma - correct answer ✔✔plasma membrane of a muscle fiber
Sarcoplasm - correct answer ✔✔cytoplasm of a muscle cell
sarcoplasmic reticulum - correct answer ✔✔The smooth ER of a muscle cell
Fascicles - correct answer ✔✔bundles of muscle fibers
Myofibrils - correct answer ✔✔bundles of myofilaments that run the length of a fiber
Myofilaments - correct answer ✔✔are proteins actin and myosin that are arranged in a repeating unit
sarcomeres - correct answer ✔✔the repeating units of actin and myosin found along a myofibril
, origin - correct answer ✔✔attachment of a muscle to the less movable part of the bone and does not
move during contraction and is on the proximal end
Insertion - correct answer ✔✔attachment to the muscle of the more movable part of the bone and
moves toward the origin during contraction
Unipennate - correct answer ✔✔-one side of a feather
-semimembranosus or extensor digitorium
Bipennate - correct answer ✔✔-two sided feather
- gastronemius or rectus femoris
Multipennate - correct answer ✔✔-many headed two sided feather
- deltoid
pennate muscles - correct answer ✔✔There is an oblique fiber pattern in which fibers do not pull in the
same direction as the line of muscle pull. There is a shorter fiber length but usually a thicker cross-
sectional area
Fusiform - correct answer ✔✔muscle fibers run in line of pull there is a longer fiber length associated
with a fusiform structure, but often not very thick cross-section
thick filaments - correct answer ✔✔composed of myosin
thin filaments - correct answer ✔✔composed of actin
I band - correct answer ✔✔· the area composed of the dark Z-line and the light area on either side of it
which are the thin filaments
A-band - correct answer ✔✔· term for the darker area from one end to the thick filaments to the other,
including the area where the thin filaments overlap the thick filaments
