BIO 201 EXAM 3 MUSCLES |COMPLETE QUESTIONS WITH 100%
RATED EXPERT SOLUTIONS |2026 LATEST UPDATED
List AND describe the functions of skeletal muscles - (answer)Movement, posture, support,
provides heat, storage of minerals
List AND describe the characteristics of skeletal muscle - (answer)Responsiveness:(excitability)
to chemical signals, stretch and electrical changes across the plasma membrane
Conductivity:
local electrical change triggers a wave of excitation that travels along the muscle fiber
Contractility: shortens when stimulated
Extensibility: capable of being stretched
Elasticity: returns to its original resting length after being stretched
What are two other names for a muscle fiber? - (answer)Myofiber, myocyte
Describe the number and location of nuclei in a myofiber - (answer)Many nuclei under the
sarcolemma
Muscle cells are packed full of which type of protein filament? - (answer)Actin and myosin
,Make sure you understand the difference between a myofiber and a myofibril -
(answer)Myofiber=single muscle cell
Myofibril=bundles of actin and myosin
What is another name for the muscle cytoplasm? - (answer)Sarcoplasm
What is another name for the plasma membrane of a myofiber? - (answer)Sarcolemma
Describe the location of the T tubules, sarcoplasmic reticulum, and terminal cisternae. What is
the function of each of these structures? - (answer)T tubules: circle around myofibrils, tunnel like
infolding that penetrate the cell
Sarcoplasmic Reticulum: network around each myofibril
Terminal Cisternae: dilated end tracts which store calcium
What is a "triad" referring to? - (answer)1 t-tubule and 2 terminal cisternea
Label the connective tissue wrappings of a skeletal muscle. - (answer)
,What is an aponeurosis? Where are some regions in the human body might you find one? How
does an aponeurosis differ from a tendon? - (answer)A sheet like structure found in places like
the bottom of the foot or palms of the hands. Aponeurosis is different from a tendon because a
tendon is a cord like structure
What is the name given to the contractile unit of muscle? - (answer)Sarcomere
What protein is the thin filament made of?
What protein is the thick filament made of? - (answer)Thin: actin
Thick: myosin
What exactly is a cross bridge? - (answer)Myosin heads
What is the function of a Titin protein? What two regions of the sarcomere does it connect? -
(answer)Titin connects myosin to Z discs and aides in contraction and relaxation
Which band of a sarcomere contains only actin? - (answer)I Band
Which band of a sarcomere has actin and myosin? - (answer)A Band
, Which zone of a sarcomere has only "bare" myosin? - (answer)H Zone
Which region of a myosin molecule attaches to actin? - (answer)Head
1. What happens to the sizes of the following bands/regions of sarcomere during contraction
AND relaxation?
a. Distance between Z - Lines
b. Size of I - Band
c. Size of A - Band
d. Size of H - Zone
e. Length of individual actin and myosin filaments - (answer)a. Stays the same
b. Shortens
c. Stays the same
d. Shortens
e. Stays the same
RATED EXPERT SOLUTIONS |2026 LATEST UPDATED
List AND describe the functions of skeletal muscles - (answer)Movement, posture, support,
provides heat, storage of minerals
List AND describe the characteristics of skeletal muscle - (answer)Responsiveness:(excitability)
to chemical signals, stretch and electrical changes across the plasma membrane
Conductivity:
local electrical change triggers a wave of excitation that travels along the muscle fiber
Contractility: shortens when stimulated
Extensibility: capable of being stretched
Elasticity: returns to its original resting length after being stretched
What are two other names for a muscle fiber? - (answer)Myofiber, myocyte
Describe the number and location of nuclei in a myofiber - (answer)Many nuclei under the
sarcolemma
Muscle cells are packed full of which type of protein filament? - (answer)Actin and myosin
,Make sure you understand the difference between a myofiber and a myofibril -
(answer)Myofiber=single muscle cell
Myofibril=bundles of actin and myosin
What is another name for the muscle cytoplasm? - (answer)Sarcoplasm
What is another name for the plasma membrane of a myofiber? - (answer)Sarcolemma
Describe the location of the T tubules, sarcoplasmic reticulum, and terminal cisternae. What is
the function of each of these structures? - (answer)T tubules: circle around myofibrils, tunnel like
infolding that penetrate the cell
Sarcoplasmic Reticulum: network around each myofibril
Terminal Cisternae: dilated end tracts which store calcium
What is a "triad" referring to? - (answer)1 t-tubule and 2 terminal cisternea
Label the connective tissue wrappings of a skeletal muscle. - (answer)
,What is an aponeurosis? Where are some regions in the human body might you find one? How
does an aponeurosis differ from a tendon? - (answer)A sheet like structure found in places like
the bottom of the foot or palms of the hands. Aponeurosis is different from a tendon because a
tendon is a cord like structure
What is the name given to the contractile unit of muscle? - (answer)Sarcomere
What protein is the thin filament made of?
What protein is the thick filament made of? - (answer)Thin: actin
Thick: myosin
What exactly is a cross bridge? - (answer)Myosin heads
What is the function of a Titin protein? What two regions of the sarcomere does it connect? -
(answer)Titin connects myosin to Z discs and aides in contraction and relaxation
Which band of a sarcomere contains only actin? - (answer)I Band
Which band of a sarcomere has actin and myosin? - (answer)A Band
, Which zone of a sarcomere has only "bare" myosin? - (answer)H Zone
Which region of a myosin molecule attaches to actin? - (answer)Head
1. What happens to the sizes of the following bands/regions of sarcomere during contraction
AND relaxation?
a. Distance between Z - Lines
b. Size of I - Band
c. Size of A - Band
d. Size of H - Zone
e. Length of individual actin and myosin filaments - (answer)a. Stays the same
b. Shortens
c. Stays the same
d. Shortens
e. Stays the same
