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BIO 115 Exam 3 Guide with complete solutions
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BIO 115 Exam 3 Guide with complete solutions
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BIO 115 Exam 3 Guide with completesolutions
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
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